Foreword: Time rushed, I remember when Xiaomi's first mobile phone M1 was released in August 2011. It was a hard time to get it. At the time, the DEFY (Motorola ME525) who had used it for several months had found the next home, using Optimus 2X (LG P993). , helpless country P993 missed the upgrade Andrews 2.3, then entered the first millet in my life - M1, red rice series listed at the end of 2013 is once again deducted what is called cost, love I can not miss the early adopters However, the first time to find a channel into a red rice 1, but found out after the release of the voice is too small, it is easy to miss the phone, when the colleagues gave me Amway, but the value of bursts of Huawei P6, I can not Living P6 slim temptation will immediately abandoned the first red rice 1. Unexpectedly, after three years in a row, the blessing of Aunt Zhang’s mother, once again meeting with the red rice, has gone to the gossip and the following questions have been reached :
First, appearance display
1 Packing out of the box
The front package shows three different colors of red rice Note4, which are gray, silver and gold. The front panel of the grey model is black, and the other two are white. This package is compact and compact, and the box has a strong hardness, which provides convenience for bulk transportation.
Behind the box is marked with the details of the factory, it can be seen that the red rice Note4 sent is a silver-white high version. What is gratifying is that unlike Redmi Note3, this generation of red rice Note fully supports the entire Netcom, low version of 899 yuan will be able to enjoy the full Netcom and all-metal fuselage price really good.
Product packaging
Product out of the box
2 Accessories Introduction
Red rice Note4 charging head output is 5V/2A, and does not use the current popular fast charging technology, the actual charging efficiency will be detailed later evaluation, charging head compact and portable, surface piano paint subdivided bright, but the wear coefficient decreased, With a long time will be scratched.
The data line is relatively thick, and the normal use is not easy to break, and the toughness is almost at hand, and plugging in the data line while playing will be a bit of a hindrance. 
Now smart phones can be used to get started, has long been a thick specification of the era, four pages of paper: to get started guide, three packs of vouchers, precautions, take the card pin.
There is nothing to get the card, the hardness is high, but I am now more than miss the era of the card can not change the card, sometimes want to take a SIM card everywhere to find this stuff is quite a headache, hope that the future mobile phone manufacturers can develop a simple Faster card design or better ideas.
3 front of the phone
There is no LOGO on the front of the mobile phone, which results in low recognition, which makes it difficult to tell which one it is. However, this design also satisfies some people’s “Muji†plots. The border is very narrow, the screen is relatively high, and the front face is pretty. The value is in the middle and upper level of the same level.
The front screen uses 2.5D fox-face glass, which reflects beautiful curved lines of light under light. The narrow edges around the curved surface make it possible to achieve a high coverage rate even with a tempered film.
The light distance sensor and the front camera are respectively arranged on the sides of the handset of the mobile phone, and the shape and size are the same, which is commonly called white face.
Below the traditional Android three key design, touch sensitive. Because it is a fixed design, the task key and the return key cannot be reversed. It is necessary to adapt to a certain period of time when the user who is used to the left side returns.
Thanks to the design of the ultra-narrow frame, the width of the mobile phone is controlled at about 76mm. After the addition, the narrower back arc surface makes the entire mobile phone hold a strong sense. The weight of the entire 175g is a little heavy in the hand. What do you think is too much? It is important to know that he is even lighter than the 188g IPhone7 plus. 
Breathing lights have also been played in a new realm. There are 6 colors to choose from: blue, red, yellow, green, blue, white and purple.
4 The back of the phone
No upgrade can be called Note4, compared to the red and green Note3 up and down both ends of the plastic material, red rice Note4 truly full metal integration body, CNC shaped aluminum body with two nano-injected signal antenna It is a three-piece back shape. 
Compared to the smooth surface of the red metal technology on the back of the red rice Pro, the ceramic sandblasting used on the surface of the red rice Note4 is more comfortable to feel and the wear resistance needs to be considered.
The main camera and the fingerprint identification area are lined up symmetrically with the twin color temperature flash. It was a pleasure to see that the camera did not stand out and the protective glass did not wear out easily. 
This angle can be clearly seen from the curvature of the back to both sides of the edge, as a 5.5-inch screen and not light weight machine, this treatment makes the phone not only looks less thick, but also can improve the comfort of grip.
5 phone frame
Both the upper and lower laps of the mobile phone frame are polished by the CNC to produce a high-light chamfer. This method can easily and crudely reflect the texture of the metal. Of course, the drawbacks of the edge-to-edge handcuffs are also found. The side is more smooth. 
Both the power button and the volume button are placed on the right side of the fuselage, and the pressure is moderate and the feedback is powerful and powerful. 
The SIM card slot is hidden on the left side. There is no obvious color difference between the slot and the frame, and there is no looseness when plugged in. It is rare to see such a process on the red rice series. 
The SIM card slot adopts a three-in-two design, which can support both a micro SIM card and a nano SIM card. The nano SIM card supports a maximum of 128G memory card expansion. 
The top of the mobile phone is a noise reduction microphone, infrared emission port, 3.5mm headphone jack, red rice Note4's infrared remote control simulation to provide a life-saving medicine for the numerous people in the home remote control, so far infrared, Bluetooth, Wifi these kinds of mainstream remote control Everything. 
In the middle of the bottom of the mobile phone is the charging port, and the charging port is still the Micro USB port. The Type-C port used on the Red Rice Pro is not used. The outlet of the speaker is on both sides of the charging port. On the side of the return key, the sound hole on the other side is designed to pursue symmetry. In reality, it should be a microphone for transmission. 
In the interface between the screen and the metal body, the red rice Note4 wrapped a layer of white polycarbonate cushioning material, exactly the same design with the IPhone4, the purpose is to provide a buffer environment for the screen glass, but this buffer is not designed with The side section is flush with the entire circle of protrusions and borders, which creates a sense of passage between the screen and the border. There are still differences between the manufacturing process and the four or five thousand screens. The words always take the thousand yuan machine and the apple a bit rogue.
Second, hardware configuration introduction:1 hardware parameters
Fortunately, the red rice Note4 supports long screenshots, eliminating the trouble of frequently paged screenshots. It is learned from the configuration parameters that Redmi Note4 uses the MediaTek X20 (MT6797m) CPU, integrated Mali-T880 graphics GPU, while carrying 3G operation Memory guarantees smooth running of MIUI8. Storage memory 64GB, remove the actual remaining 53.14GB system and built-in applications, most of the red rice Note sensor Bosch solution, stability can get a good protection.
Through the CPU-Z can intuitively see the operation of this core HelioX20 10 core, but the parameters are not accurate, through the MediaTek official online that this architecture for the 20nm ten core processing is subdivided into three layers of collaboration, The strongest performance is a dual-core A72 architecture with a maximum frequency of 2.5 GHz, a medium-performance quad-core A53 architecture with a clock speed of 2.0, and a quad-core A53 clock with a frequency of 1.4. In the Andrews camp where nuclear wins, I think the ten-core CPUs are at least superfluous in terms of parameters. As for the concept of three-tier collaboration, I believe that the future leaders will have deep feelings. After all, MediaTek has always been known for low power consumption and low heat. Well.
2 hardware performance
Through the security Bunny test score close to 77000, after upgrading the latest version of MIUI8 data has significantly improved, the highest ability to over 80,000, although this data test does not make much sense, but still can be seen through the comparison compared to the last year listed Charm Blue Note2 The performance is greatly improved.
Left Charm Blue Note2 score: 34466 , right is red rice Note4 score: 76,989 , unexpectedly thousands of phones once a year after the phone performance more than doubled.
3 screen quality
As a thousand-yuan machine, the upgrade in the past two years is not obvious. It is a pity that Redmi Note4 does not use the AMOLED screen created by the Red Rice PRO. It does not open up the gap with the Charm Blue Note2 in color reproduction and grayscale performance.
Screen color evaluation has always been to see everyone's joy, and some people like the colorful and some people prefer natural, like the above several groups of comparison, Charm Blue Note2 display color more pleasing, in fact, the color of the Note Blue Note2 bias is obvious bias Warm, and red rice Note4 color reproduction is closer to reality.
There was no obvious light leakage on the mobile phone screen, but the angle was also good and the overall performance of the screen was satisfactory.
Third, the system features
1 system interface
The MIUI8 application icon follows the simple and elegant design of the Xiaomi system. The overall color of the new system is more elegant, the APP icon is larger and the drawing rate is higher. The consistency of the icon style can be ensured, and the application will display the progress during installation. Overall, the application progresses. It is extremely flat.
MIUI8 is based on the Android 6.0 system and inherits a consistently high degree of freedom and playability. There are many customizable items in the setup options. Now that MIUI integrates what you can think of, it also causes many people to reflect that the current MIUI system is too bloated, and it has also won the title of ADUI not long ago. Fortunately, a lot of pushes can now be turned off, but if you want to completely block advertising, you may not be able to do any of the current systems.
MIUI8-File Management
MIUI8-Calendar
The number of system updates is the most frequent in Android phones. The constantly improving system can bring about a better user experience. It is found that the hard-to-use quick switch before this update can finally show all through the slide, using the upper and Meizu Flyme is the same, I can only say that the system is really getting more and more similar. Each system is "taking its essence and going to its dregs". Even the Apple system is learning from Android in certain aspects. It is also possible to do so. The original.
2 One-handed operation
It is almost impossible to operate the 5.5-inch screen with one hand. Fortunately, it can be compensated by the one-handed mode of the system. After the function is turned on, the finger scrolls from the home key to the back key to open the right hand small screen, and the reverse slide closes the single hand. Mode, from the home button to the task key can open the left hand small screen.
3 Sweep
MIUI8's sweep is also very rich in functions, not only the daily two-dimensional code and bar code, but also support sweeping Amoy, translation, scanning questions, scanning business cards, scanning documents, such as taking a photo of a stapler will In the popup stapler's purchase link.
4 mobile phone avatar
Through setting, a different fingerprint password can be used to enter the mobile phone avatar system. In this mode, the mobile phone application and file storage are independent, just like another mobile phone, except that the switching between the normal system and the avatar system will be slight. Delay, secret in the cell phone (big sister ) Many people strongly recommend turning on the phone.
5 application double open
The application of dual-opening is like hanging two QQs on a computer. Most of them are used in communication software. This way, one number can be worked and one family number can be used. Simultaneous use does not affect each other.
Fourth, use experience1 Routine APP application fluency
MediaTek X20 is equipped with 3G of running memory to provide a reliable experience, browsing Weibo, WeChat, worth buying and Jingdong running fluency is satisfactory.2 Game Performance Test
Ring of Chaos 2
Predator
NBA2K17
vanity
Red Rice Note4 - Vanity Game Experience: 
Tested several games that require higher mobile phone hardware, there is no Kardon phenomenon, see a lot of people mobile game evaluation using the king's glory, I use this in the unconventional use of the more demanding vanity test, the same perfect run.
3 4K video playback
Some of the downloaded 4K demo videos have been successfully played, but the use of charm blue note2 is only the sound without images, the X20's video decoding capability is still sufficient to deal with 4K, other low-resolution natural.
4 Fingerprinting
Red Mi Note4 fingerprint unlocking input time is very short, when used to touch the index finger to complete the unlock, without any delay, here Red Rice PRO pre fingerprint identification and NOTE4 post fingerprint identification is better Let me simply say: Fingerprint recognition does not need to adjust the hand posture skills to complete the fingerprint function on the back of the mobile phone. The disadvantage is that when the mobile phone is flat on the desktop, it needs to pick up the mobile phone to complete the unlocking and the back looks less complete. The fingerprint recognition is placed on the front When unlocking, it is necessary to adjust the hand posture to make the thumb go to the touch button, so that the flat desktop can be directly unlocked. The biggest drawback is that the life of the front button will decrease with the use frequency. Therefore, there is no real superiority or inferiority in this fingerprint recognition.
5 WIFI rate
The average speed of using WIFI to download games at home can be 5M/S. It should be based on 5G-WIFI for data transmission. The speed is very fast. WIFI does not appear unstable during daily use.
6 mobile phone remote control
Enter the mobile phone remote control interface, you can customize matching or learning all kinds of infrared remote control, support the remote control type and brand is very comprehensive.
After connecting the router, she automatically connected to the home's millet box and tested the remote control function. The reaction was sensitive. There were too many remote controls at home, and the next mobile phone was all set. It was really convenient.
After connecting the box, you can simulate the game controller, and the bully has fun !
Five, fever and endurance test 1 temperature test during the game
The mobile phone has obvious fever after running the game, plus the good thermal conductivity of the back metal material, by testing the phone temperature is highest near the back of the camera, which is also the CPU's safety, the temperature reached 36 degrees, a long time high intensity operation will be slight Hot.
2 Endurance test
The 4100 mAh battery still has 26% of remaining power after 3 hours of use. It contains 30 minutes of game use. If you use it lightly for two days, it should be OK.
3 Charging test
Here's my charge rate data measured in 10 minutes:
10 minutes charge complete 11% / 20 minutes charge complete 19% / 30 minutes charge finish 27%
40 minutes charge complete 35% / 50 minutes charge complete 43% / 60 minutes charge complete 52%
70 minutes charge complete 60% / 80 minutes charge complete 68% / 90 minutes charge complete 76%
100% charge completes 84% ​​/ 110 minutes charge completes 90% / 120 minutes charge completes 95%
130 minutes charge complete 97% / 140 minutes charge complete 100%
1 operation interface
The camera's operation interface is more concise, the upper left corner of the switch flash, the upper right corner of the switch HDR, on the phone HDR this function, generally should be more than one exposure of different photos superimposed into an image, the same scene in detail highlights and shadows at the same time Clear reservations provide more dynamic range and image detail. So use this function to keep the mobile phone as steady as possible, or the exposure will not be enough to affect the capture of dark details. In addition, the focus metering point can directly adjust the exposure compensation of the mobile phone, that is, the image brightness.
Open mode selection features full coverage, beauty mode and night scene stabilization.
Red rice Note4 camera level will appear to open the balance box, always ensure that the camera is in a horizontal state, need to be reminded that in this mode if the tilt state photographed resolution will be reduced, because the principle of shooting a full-size photo Make a horizontal cut.
The camera settings page is also very versatile, and the volume keys can be used to customize the camera or zoom.
2 rear camera
Redmi Note4 rear camera uses mainstream 13 million pixels, F2.0 aperture, support PDAF phase focus, 5-piece lens, take a look at the camera performance below.
Indoor proofs comparison: 
Red rice Note4 photo proofs 1
Charm Blue Note2 photo proofs
Red rice Note4 photo sample
Charm Blue Note2 photo proofs
Detail performance: 
Shoot a building 50 meters away. Take a sample of a small area. You can see the lines of the windows and guardrails of the building are clearly visible, and the details are fairly good.
Outdoor proofs display: 
Location shooting when the red rice Note4 shooting white balance stability, shooting scene color is more lustrous than the real color, details capture in place, but the photographs commonly exist in the case of dim brightness, hope to upgrade in the future can be improved.
Night shot:
f/2.0 1/10 ISO2313
Night shots appear to have more noise, mainly because the ISO is adjusted to more than 2000 by default at the time of shooting. It seems that you want to take good night photos and need to be able to fix the support of the mobile phone. In addition, the exposure is often extended to get a more pure picture. ISO You must manually set the low point.
Video quality:
Video recording supports common recording, fast motion, and slow-motion recording at three rates, which improves the playability of video recording and does not require special processing in later stages. It is necessary to pay attention to the fact that when the video quality is set to full HD, it is slow. Action cannot be turned on.3 front camera
The camera on the front camera is in line with expectations. Since I was inconvenient, I asked my son to take a selfie.
Seventh, summary suggestion1 Advantages
Red rice Note4 changed the sense of low-end machine gives thousand people, in the shape and material of the phone has greatly improved, all-metal body and nano-injection molding process is the decentralization of the previous flagship product, machine performance, no short board , Large-scale games, 4K video can run smoothly, MIUI has a high degree of playability, a series of intimate functions such as mobile phone split, application double-open, etc. can greatly enhance the mobile phone experience to meet the needs of different users, the infrared remote control added to the mobile phone More able to solve the home of many remote control problems, making mobile phones not only become smart home remote control entrance can also have traditional home appliances infrared remote control, in short, red rice Note4 count millet in recent millet's sincerity.
2 Insufficient
Although all aspects of product experience can give a satisfactory experience, but there are still several imperfect places exist, first of all, the overall color of the red rice Note4 photographed dark, hope to improve the camera through the system upgrade overall dark problem. Then the mobile phone is not equipped with fast charging. It takes a long time to fully charge the battery. The last point is my nitpicking, because many users have noticed that the Redmi Note4 did not use the CPU of the Qualcomm Snapdragon 650. This generation of products failed to meet Qualcomm. Powder demand.
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