TOZO AMOLED S4 AcuFit One Smart Watch 1.78" Ultra-Clear Screen for Men Women, Call/Answer Fitness Tracker,Sleep Monitor IP68 Waterproof for iOS 11.0+ Android 9.0+ Black
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30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
20 left in stock
Arrives
Thursday, May 22
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Color: Black
Features
- User-Friendly Design with AMOLEDFeaturing an upgraded 1.78'' ultra-clear AMOLED HD Display with 368*448 resolution, which has 25% faster response speed than previous, a wider visual range, lower energy consumption, wider color gamut, and higher contrast, TOZO S4 takes you to experience unprecedented crystal clear visual effects.
- All-in-One Smart WatchTOZO smart watch is the perfect companion for both men and women, combining a fitness tracker and a stylish accessory all in one. Stay connected with its Bluetooth calling feature, as well as call logs and message notifications.
- Comprehensive Health MonitoringTOZO S4 adopts an high-precision sensor that accurately stress testing in real time. Furthermore, the health watch tracks your sleep patterns to ensure you get the restful night's sleep you deserve, including deep sleep, light sleep, and REM sleep stages.
- Versatile Fitness TrackerWith over 100 different sports modes, our TOZO S4 helps you stay active and reach your fitness goals. Whether you're running, cycling, or practicing yoga, this watch will accurately track your workouts and provide valuable insights to improve your performance.
- Worry-free Battery LifeEquipped with a high-capacity 300 mAh battery that ensures up to 7 days of use on a single charge, ultra-long 30 days standby mode, and takes only about 2 hours to fully charge, The activity tracker fulfills your need for long battery life on business trip or travel. Plus, it is waterproof, making it perfect for daily outdoor activities.
Operating System: NO
Memory Storage Capacity: 128 MB
Special Feature: Touchscreen, Email, Text Messaging, Activity Tracker
Battery Capacity: 300 Milliamp Hours
Connectivity Technology: Bluetooth
Wireless Communication Standard: Bluetooth
Battery Cell Composition: Lithium
GPS: No GPS
Shape: Square
Screen Size: 1.78 Inches
Product Dimensions: 6.46 x 4.5 x 0.75 inches
Item Weight: 1.38 ounces
Item model number: S4
Batteries: 1 Lithium Metal batteries required. (included)
Date First Available: November 7, 2023
Manufacturer: TOZO
Country of Origin: China
Item Weight: 39 Grams
Standing screen display size: 1.78 Inches
Memory Storage Capacity: 128 MB
Ram Memory Installed Size: 128 MB
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, May 22
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
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Top Amazon Reviews
Color: Black
Tozo has always been my goto brand for premium earbuds or wireless chargers without the premium cost, so I had to try the smartwatch too. So far I’m really impressed with this smartwatch. The screen is super clear, it tracks all my fitness stats fairly accurately, and the battery lasts several days. It looks sleek and works just like some of the more expensive brands. It’s simple - yet efficient. I have used an Apple Watch for years and it’s fairly comparable. The only thing that’s not as ease of use is the watch bands and charging (compared to Apple that is- probably due to patents) but once again for the price point, that being the only knock is amazing. Definitely a great value—highly recommend!
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Reviewed in the United States on May 10, 2025 by Evan H. Evan H.
Color: Black
Very comfortable and sleek looking. Hard to believe all the features you can get for this price. Syncs up with the phone and app very easy and you're really able to customize it. I really appreciate being able to control exactly which apps are able to send notifications to the watch. As always Tozo never disappoints and in fact goes above and beyond when it comes to quality, features, and value.
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Reviewed in the United States on April 8, 2025 by Leroy Macintosh Leroy Macintosh
Color: Rose Gold
So I got this watch for my wife about a month ago because she wanted a simple smart watch that would do some basic features for when she is exercising. We were both pleasantly surprised by this <50$ watch. The build quality feels very good, there are some nice color selections, and the battery is phenomenal. My wife needs to charge it like once every 12 days. You are limited with the functions of the watch by what is already pre installed, you can't add any software to it and it doesn't support notifications from all apps on my wifes android phone but it does cover the basics. You have multiple languages to choose from but even if you set the watch to metric the weather app will keep displaying in Fahrenheit which is kind of annoying, but you can live with it. One thing I wish they could also fit in would be an auto screen brightness, you set it to the brightness you want and that stays which makes it hard to read in sunlight at times. It comes in a really nice packaging, and setup is easy, download the Tozo Health app and follow the instructions and within 2mins you are up and running. If they could fix a few of the little items I would easily give it 5 starts for a sub 50$ watch.
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Reviewed in the United States on September 27, 2024 by Cedric
Color: Black
I’ve been using the TOZO AMOLED S4 AcuFit One Smart Watch for a few weeks now, and it’s been a pleasant surprise. The 1.78” AMOLED display is crisp and vibrant, making it easy to read notifications and track fitness stats. Navigating through the menus is straightforward, and the watch feels lightweight and comfortable on the wrist. In terms of functionality, it covers all the basics: heart rate monitoring, sleep tracking, step counting, and even Bluetooth calling. The battery life is impressive—I only need to charge it once a week. While it doesn’t have some of the advanced features of higher-end smartwatches, for its price point, it’s a solid choice for anyone looking for a reliable fitness tracker with smart capabilities.
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Reviewed in the United States on May 6, 2025 by Michael MacMillan Michael MacMillan
Color: Black
After a few days of use I can say that this smart watch, while has a lower build quality compared to name brands such as apple watch or Samsung, it is still a valuable purchase. It is light, holds good charge, the screen quality is high and enjoys many functions. Also, it is pretty user friendly to navigate through different features. Of course, at this price point, there is no wireless charging or fancy bands, but in my opinion it is a good entry level smart watch for daily use.
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Reviewed in the United States on April 20, 2025 by Raina Raina
Color: Black
This is my first smart watch and I got it shortly before a trip. I had thought about getting one previously but being someone who hasn’t wear a watch in years, I had been putting it off. Finally decided to take the plunge. I wasn’t sure what to expect but am pleasantly surprised by it. Very easy to use out of the box. I downloaded the TOZO Health app and paired it with my phone. It can track some health information, such as heartbeat, steps, stress level, sleep habits. It was nice to be able to track these on my trip as I walked a lot. Also, the watch does change time zone when you travel but it takes a little time to do so. The weather, however, is to the location you set on the watch and it does not change based on your physical location. You need to turn on notifications from the app to receive and take calls from your phone. I tried the call function a couple of times and it works well; I was able to hear the caller and they can hear me. To get text messages and other notifications, you also need to go to notifications on the app, under app messages, and you can select what app to turn on notifications for. It has a bunch of selection like Facebook, Instagram, etc. but it doesn’t list Messages app for iPhone. However, turn on “Others” and you will be able to get Messages app notifications as well as others that are not listed. I like being able to see the text messages on the watch, but you can’t respond from the watch, so that is one improvement that can be made to the next version. You can also set notifications or reminders to get up and walk around at hour intervals, drink water, wash your hands, or take your medicine. Or set additional alarms or reminders. The app contains a lot of options for the watch display; it has 4 preset displays which can’t be changed and 1 you can change. It would be nice if you can change all four displays to your own selection, or choose what information you want displayed, so another area for improvement. The watch does not have the ability to go online and surf the web for information. Also, it was a little confusing at first as some functions can be set on the watch itself while others need to be set on the app, or some can be done on either the watch or app, so it takes a little bit to get used to as to where to find certain things. The band is wide and comfortable. I did sleep with it on the first night just to see how it works; the watch is a little big and I can feel it as I put my arm on my head occasionally when sleeping, but I am someone who hasn’t wore any watches for years so it would take some getting used to. The watch provided me information about how long I was in different stages of sleep (REM, deep, light). The watch also has exercise functions (can set goals and track to see if you meet them), but I haven’t used this function except to track steps. Battery life is great as I can go for 4-5 days without charging; I usually charge it when it goes below 50% battery life so I can probably go for a few more days. Family members who are Apple watch users told me they have to charge theirs daily. Not having to charge daily is a big plus for me. Overall, I am VERY impressed with my first smart watch and would recommend it given its price point and functionality.
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Reviewed in the United States on February 24, 2024 by Curious4