AmazfitGTS 4 Mini Smart Watch for Women Men, Alexa Built-in, GPS, Fitness Tracker with 120+ Sport Modes, 15-Day Battery Life, Heart Rate Blood Oxygen Monitor, Android Phone iPhone Compatible-Black

Amazing product, the functions and all the sports that can be tracked are very good, great design minimalista and pretty, the size is very reasonable nor very large and big enough to navigate through the options.The most outstanding feature is the insane battery, I almost got two to three weeks depending on the activities done, measure almost all the movements, sleep, stress pretty decent job ver very recommended the price is great!

I've had the following watches: Moto 360, ZenWatch 2, Galaxy Watch (1 & 3).Most of those met an untimely end due to ONE issue, the firmware would get updated and the device would become unbearably slow. Google Watch OS or Tizen OS, didn't matter. The Moto, however, had display issues that Moto wanted me to pay for fixing (under warranty).These are a breath of fresh air. No fancy gimmicks or useless gizmos. They did a great job including features that are useful but not wasteful. Most importantly, the OS (i think it's RTOS) means it's never slow.The battery life is great. I went on a week long trip to my sister's place and didn't need to bring a charger. Used AOD 50% of the time (timed to turn off after 8pm, back on at 8am).If you want a smart watch that you can receive notifications with, but that doesn't require you to watch the battery percentage all day, this is fantastic at it.Couple of caveats (forgiven at this price point):1. Glass isn't very durable, I've got a few chips in mine.2. OS isn't super stable. I've seen it crash and reboot a few times, but the reboot time is very fast.3. Watch faces aren't really that great on the market. I attempted to make my own and you have to upload an individual picture for each number, for each position. Who designed that???4. AOD will not have the numbers line up exactly with the watch face. This is by design to save the screen from burn in.5. It should be easier to have maps display route guidance (just next turn direction and distance is all you need). Currently you need to install a companion app (which requires permissions it doesn't need) and if you put your watch down for too long (you know because you are driving...) it will put the app to sleep and you need to go back in to open it again. At the very least, remember what app was open and open back up to it.6. Duplicate text notifications. I believe this to be an API limitation from Android. However, you can solve this in software by keeping track of recent texts and double checking they aren't the same before displaying them. I've programmed a system like this before for Twitch's API due to mirror update lag. It's not beyond capability.7. The companion app (required for a lot of stuff to work) seems to collect and sell your data to offset price on watch. I'm personally fine with this, but you should know that before you buy.

Most of the features work as advertised, I slept with the watch on my wrist and the sleep time was correct. The steps matched the steps on my apple fitness app, and the heart rate seems correct. The Zepp app was easy to use in the setup process, the app offers watch faces, some free, others you have to buy, but their very cheap. I also like the fitness notificiation that alerts you take a walk if your sitting for a long time. The battery is good, after 7 hours of sleep the battery was at 88%.the only con is that some of the features on the app require a watch upgrade and the weight tracker feature isn't available for this version.Overall, I'm happy with this tracker

I've been wearing it for 11days now and so far it has exceeded my expectations.Battery Life: I fully charged it the first day and now it's 34% (11 days later). I have the watch display set to turn on when I raise my arm only. I have the watch tracking only about half the health data it could be tracking and I have it reassess my heart rate every 30min. The only alerts I allow are calls, texts, calendar, and Amazon notifications. I wear it all night when I sleep. So I'd say my usage is moderate. I would imagine with the Always On Display and having it track every health option it would consume the battery much faster. My charge time was about 2 hours.Battery Life (UPDATE): When I don't track my sleep with it and by putting the watch on Battery Saver mode while not using it (like at night) I charged it to 80% and then 20days later its now 38%.App Compatibility: It works with all the essential apps, it even works with Whatsapp.Health Tracking: So far everything seems accurate except for one problem. I work the night shift and the watch doesn't seem to understand how to track my sleep when I sleep during the day. It says my sleep is 100% light sleep only when I know for a fact that's not true since I am a very deep sleeper when I dream. When it tracks my sleep at night, it records very well.The Button: That button on the side is just a button, it doesn't scroll. You can program it to do certain shortcuts when you press it or hold it.The Display: It's plenty bright and it has auto dimming which is cool. As you can see in the photo, you can select a custom photo as your background (I chose a Batman them). The resolution is nice on the eyes and the screen is very responsive. It's not a flagship screen swiping experience but it's pretty dang close and it's hardly anything to complain about since the price for a watch of this caliber is unmatched.Water Resistance: You can definitely swim with this, no problems there at all. It will still display the time under water when I turn my wrist over, but the swiping feature doesn't work until you get it out of the water.Comfort: I always forget I'm wearing it. It's so light and the wrist strap never slips or irritates me. I wear it when I sleep and it never bothers me. The only time I take it off is when I shower or workout (I could leave it on for those things but I choose not to).This watch is great. I only say that's it's "almost" the best is because it doesn't know how to track sleep during the day. Other than that, this watch does everything you need a smartwatch to do, minus being able to respond to calls or messages through the watch. I don't need or want that feature anyways, that's what I got a phone for. I use a Samsung Galaxy S22 Ultra and so far I don't have any compatibility issues. Took me a couple days of playing around with the watch's app to fine tune it so the watch runs the way I want it to, but the app was pretty straight forward.Love this watch, would recommend to anyone.