In fact, I just wanted to write an original when I just bought this phone, but because I was too lazy to put down a message after I saw Auntie, I actually bought the phone and I also appreciated the value of buying it instantly.
Due to rising cost of component purchases and exchange rate fluctuations: MI Xiaomi raised the retail price of red rice 4 series up 100 yuan in 2016. MI (millet) re-adjusted the red rice product line, and the low-, middle- and third-grade products dominate the market, and is equipped with Qualcomm Xiaolong. 625 red rice 4 and hundred yuan red rice 4A carrying the "double 11", "New Year" sales season, really achieved a good result, so the red rice 4 series has a considerable "market heat." However, due to the "rising component procurement costs" and "exchange rate fluctuations" at the end of 2016, and for the continued supply of the Red Rice 4 series, Xiaomi Zan 217 reviews 350 collections 34 details Aunt Aunt Zhang saw the consultation a while ago and wanted to pull out the photo she had taken before and wanted to write it again. However, she was dragged to the present because of her laziness. (It was really a hard life from a double 11 in 16 years to 16 years ago. 618 ah, watching the new round of pickpockets is about to begin, in order to give the original outflow space can no longer rely on it, so began to write about memory ~)
Reason for purchase:
Although I can't say that it was millet's iron powder, my first Android smart phone was Xiaomi 1, before which I was Nokia's Saipan system E63 full-keyboard smartphone (I feel very good now. ), Millet 1 mobile phone was born at the price of 1999, the price of smart phones from 3,000 to 4,000 to pull down the altar be regarded as a gospel for the majority of mobile phone users, after the millet 1S Youth Edition price is to 1499 Price. I think Xiaomi's flourishing development is inseparable from the relatively high-end configuration of Xiaomi’s preferential prices. Of course, the horrendous hunger marketing sales model also contributed.
After that, although my main mobile phone has been changing, but always around with a millet phone to prepare machine. Later, the millet phone began to move towards the high-end, and the low-end red rice phone began to come out, so the red rice phone will undoubtedly become a backup machine The best choice, and look at the red rice phone is really a one-year change ~ and the price of about 500 people also do not feel distressed when changing.
Millet red rice 4A Netcom 2GB memory 16GB ROM Champagne gold mobile Unicom Telecom 4G mobile phone dual card dual standby 599 yuan to send a 499 high cost performance ~ Although later prices but it is still a good preparation machine Jingdong direct link 
OK, so we're back to the box.
From my purchase of the first millet phone, Xiaomi started using this kind of cardboard and paperboard packaging, and it is still so. It seems that this packaging has stood the test of time.
The package contains a red mobile phone 4A, a purchase list and an invoice.
The phone's box is very simple, the white outer box is only red rice 4A, MI logo and a 4A watermark.
Internal only mobile phones, product manuals, charging sockets and charging lines, and a firing pin for card retrieval.
This time I was pleasantly surprised to find that the included charging plug attached a QR code sticker to the USB interface.
Direct comparison of the shape we can see, the new red rice 4A can be seen from the red rice 2A before the red rice 4A mobile phone is longer, in addition to the overall appearance of the screen compared to the red rice 2A also longer.
Although the mobile phone is longer in length than the red rice 4A, the width of the mobile phone is consistent.
The design changes on the back of the mobile phone are relatively large. First, the position of the camera is changed from the middle position of the red rice 2A to the upper left corner of the mobile phone, and the power amplifier of the mobile phone is also moved from the upper part of the mobile phone to the lower part of the mobile phone. Of course, the red rice 4A is Low version, not equipped with fingerprint unlocking module.
The position of the camera changes, and the camera also changes from a square convex design to a circular non-convex design, making the phone look more stylish.
The red rice 2A's lay-out position changes from the upper part to the lower part. This improvement is not just a simple change in appearance. In practice, it can also be seen that the red rice 4A sound is louder than the red rice 2A when watching videos. Clear. It's a good improvement
Comparing the bottom change only changes the charging position from one side to the middle, and you can see that red rice 4A is thinner than 2A.
The position of the handset changed little, but the position of the front camera was changed.
This time the red rice 4A phone card slot has also changed into a card-type to export type. Of course, is still dual-card dual standby, dual card dual standby mode has written in the manual.
As to why it is not possible to use two telecommunication cards or the like, we can also see that only one SIM card can be used when using an SD card in the SIM card slot, that is, red rice 4A cannot be dual-card dual card like 2A. While using SD card to expand the phone storage space.
Two cell phone slot settings contrast.
This time, Red Rice 4A is the biggest upgrade from Red 2A upgrade. It should be the battery life. The battery is increased from 2200mAh to 3030mAh. The battery capacity is increased by about 37%. Because the red rice 4A battery becomes non-detachable, I didn't put the battery. After demolition for comparison.
This picture can be more intuitive to see the difference between the two phones in the hardware. The biggest difference is that the storage upgrade from 1G to 2G, battery capacity increase is relatively large. From the figure we can see the two mobile phone CPU information center Redmi 4A's Qualcomm 425 processor is also lower than the 2A's MediaTek L1860C clocked at 0.1Ghz, but will be more fluent in actual use, of course, this may also be brought about by the improvement of more 1G storage.
Since no video was recorded at the time of unpacking, we had to use pictures for display. It can be seen from the figure that the red rice 4A has entered the system and the 2A card has been stuck in the boot interface. Side shows performance improvement. (After all nonsense hardware after a year)
Both phones have adjusted the brightness of the screen to the brightest, we can see that the red rice 4A is brighter than the 2A in the overall screen brightness, and the difference in color is not obvious, but the larger screen brings the picture to people's eyes. More comfortable.
The camera did not deliberately adjust the parameters of the camera. Only the focus position was selected. It can be seen from the figure that the red rice 4A photo is brighter than the 2A, but the detail in the bright part is better but it is shown in the dark part. Better than 2A photos
This photo feels red rice 2A underexposure and the same light does not know why the red rice 4A photos are overexposed.
The light in the room is still sufficient. The advantage of the red rice 4A in the overall picture display is still quite obvious.
As the previous photo shows, the red rice 4A camera is significantly better than the red rice 2A in close-range shooting when the light is relatively dark.
Photographed outdoors on cloudy days, it feels more faithful to the color reproduction on red rice 4A, 2A lens may be worn out because of long-term wear and some fuzzy color temperature is not quite right.
Outdoor shooting red rice 4A detail performance is stronger than 2A, red rice 2A color temperature feels lower training, shooting photos blue.
This photo has the feeling that the red rice 2A's color temperature is right ..... confused and did not figure out the situation
Whether from the exposure or the details of red rice 4A shooting more than a lot of 2A.
PS: I didn't care too much before, but after a TV remote control battery was dead, I suddenly remembered that the red rice 4A was the biggest upgrade from the red rice 2A. It was red rice 4A equipped with an infrared emitter, and the software could be used to achieve TV air conditioning at home. The control of home appliances, this is really very convenient
Red rice 4A is indeed a good mobile phone in daily use. In addition to no fingerprint unlocking, 2G storage can basically run a standby mobile phone software that needs to run, even the king of pesticides can run more smoothly, and improve The battery capacity is also relatively good to improve the machine's battery life, and the actual use of the phone's heat is relatively small - after all, CPU frequency is low.
And with a larger screen, better foreign effects are better when watching videos in daily entertainment. From the effect of photography, the photographability of Red Rice 4A is either indoor or outdoor, whether it is strong or weak. The strong madness is not a small increase compared to the red rice 2A. And when I purchased the dual 11 mobile phone starting price as long as 499, and then the price of red rice 2A is 599, can be said that such a comparison of red rice 4A cost It is still very high. Later, because of the reasons for the increase in the price of the material, all of Red Rice's mobile phones now have a price increase of 100. Now, the price of 599 is also the same as the price of 2A before. We can see that in the event of endurance, screen effect, and storage and storage are improved. Do not increase the amount of money to do ~ In general, this phone as a backup machine or buy for parents as a senior machine is very affordable and worth starting.
The main function of the Solar Charge Controller is to manage the charging and discharging process between the Solar Panel and the battery in the solar power generation system. Its main function is to protect the battery from overcharge and over-discharge damage, ensure battery charging efficiency, and stabilize the operation of the solar power generation system.
Main effect:
Charge control: The solar charge controller controls the charging process by monitoring the voltage and current generated by the solar panel to ensure that the battery is charged at the appropriate voltage and current to extend the battery life.
Overcharge protection: The solar charge controller can monitor the charging status of the battery, and when the battery is fully charged, it will automatically stop charging to avoid battery damage caused by overcharging.
Over-discharge protection: The solar charge controller can monitor the discharge state of the battery. When the battery power is lower than a certain level, it will automatically stop discharging to avoid battery damage caused by over-discharge.
Differences from other charge controllers:
The solar charge controller is a charge controller specially designed for solar power generation systems, the main differences are as follows:
Applicable Energy: The solar charge controller is suitable for solar power generation systems, mainly used to manage the charging and discharging process between solar panels and batteries. While other charge controllers may be suitable for different energy generation systems, such as wind energy, hydro energy, etc.
Charging characteristics: The solar charge controller is optimized for the characteristics of the solar panel, and can control the charging process according to the output power and voltage characteristics of the solar panel. Other charge controllers may be optimized for different types of energy generation characteristics.
Protection function: Solar charge controllers usually have overcharge protection and over-discharge protection functions to ensure the safe charging and discharging of batteries. Other charge controllers may have different protection functions, depending on the needs of the application scenario.
Overall, the main role of the solar charge controller is to manage the charging and discharging process in the solar power generation system, protect the battery from damage, and stabilize the system's operation. Compared with other charge controllers, it is optimized for the characteristics of solar power generation systems and has unique functions such as overcharge protection and over-discharge protection to meet the needs of solar power generation systems.
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