TOZO S4 AcuFit One Smart Watch 1.78″ AMOLED Screen for Men Women, Bluetooth Call Dial Fitness Tracker, Heart Rate and Blood Oxygen, Sleep Monitor, IP68 Waterproof, Workout for…

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  • 【User-Friendly Design with AMOLED】Featuring a upgrated 1.78” AMOLED HD Display with 368*448 higher resolution, which has a wider visual range, faster response speed, wider color gamut, lower energy consumption, and higher contrast, TOZO S4 takes you to experience unprecedented crystal clear visual effects.
  • 【All-in-One Smart Watch】Tozo 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 Monitoring】TOZO S4 adopts an high-precision sensor that accurately measure your heart rate and blood oxygen levels, 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 Tracker】With 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 Life】Equipped 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, TOZO S4 fulfills your need for long battery life on business trip or travel. Plus, it is waterproof, making it perfect for daily outdoor activities.
  • 【Bluetooth Connectivity and Compatibility】When the TOZO S4 smart watch is connected to the app via Bluetooth, you can control the music player, check today’s local weather, and support mobile search functions. TOZO S4 (AcuFit One) syncs seamlessly with iOS 11.0+, Android 9.0+ smartphones. Go to App Store or Google Play to download and install “TOZO Health” for free, then connect our smart watch to your phone to start your smart life journey.
  • 【Personal Appearance】The high-strength aluminum alloy shell injects solid protection into the watch. The skin-friendly material strap is designed to fit your wrist better and give you a comfortable touch. At the same time, the S4 smart watch also has a convenient magnetic charging function and provides a variety of personalized watch face options, allowing you to show your personal style as you like.
TOZO S4 AcuFit One Smart Watch 1.78″ AMOLED Screen for Men Women, Bluetooth Call Dial Fitness Tracker, Heart Rate and Blood Oxygen, Sleep Monitor, IP68 Waterproof, Workout for…
TOZO S4 AcuFit One Smart Watch 1.78″ AMOLED Screen for Men Women, Bluetooth Call Dial Fitness Tracker, Heart Rate and Blood Oxygen, Sleep Monitor, IP68 Waterproof, Workout for…


Additional information

Specification: TOZO S4 AcuFit One Smart Watch 1.78″ AMOLED Screen for Men Women, Bluetooth Call Dial Fitness Tracker, Heart Rate and Blood Oxygen, Sleep Monitor, IP68 Waterproof, Workout for…

Item Package Dimensions L x W x H

‎0.39 x 0.39 x 0.39 inches

Package Weight

‎50 Grams

Item Dimensions LxWxH

‎6.46 x 4.49 x 0.75 inches

Brand Name






Part Number


Model Year




Included Components

‎Magnetic Charging Cable, Quick Guide& User Manual, TOZO S4 Smart Watch

Standing screen display size


Reviews (8)

8 reviews for TOZO S4 AcuFit One Smart Watch 1.78″ AMOLED Screen for Men Women, Bluetooth Call Dial Fitness Tracker, Heart Rate and Blood Oxygen, Sleep Monitor, IP68 Waterproof, Workout for…

4.9 out of 5
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  1. A Guy

    I have been using a smartwatch for a few years and tried this Tozo watch. For price, performance and build quality it is superb. Seamless with a cellphone and doing micro-workouts during the day. Here are some of the good points of this watch:

    Price and Value
    The Tozo S4 smartwatch is very inexpensive compared to other comparable smartwatches in the market. About 1/10 of the cost of some Samsung or Apple smartwatches. It offers a great value for the money, as it has many functions and features that are comparable or even better than some of the more expensive watches.

    Design and Display
    Sleek and elegant design that looks good yet feels sturdy. The screen has a high resolution of 240×240 pixels and a brightness of 450 nits, whatever that means. I just know its clear and visible in any light condition. Great selection of watch faces to choose from.

    Battery and Charging
    Long battery life. I get nearly 7 days on a single charge with decent usage. , depending on how you use it. It also has a fast magnetic charging system that can fully charge the watch in about 2 hours. Always visible low battery reminder and a power saving mode that can extend the battery life even more.

    Health and Fitness
    Where this things really shines is in this area. With all the sport selections and the convenience of immediate starting it is great for micro-workouts during the day. Nor heart rate monitoring strap fiddling. This convenience is worth the watch. It gives you read out of the details of the micro-workout and saves it so you can see how you did for the whole day. I tested the heart rate and blood oxygen levels against my two oximeters and they were perfect. No heart rate device that does not use a strap is going to be precise when moving. The Tozo S4 smartwatch is a great companion for your health and fitness goals. I do not use some of the health functions so cannot comment ( sleep tracker, pedometer, etc.). I like the way the watch can sync with your phone and the Tozo app to see data and trends in detail.

    Connectivity and Notifications
    Bluetooth connections and notifications were spot on. While the watch can also control your phone’s music player and camera, and as show notifications from various apps that you can select from the app. I also like that it Google Assistant.

    Other Features
    It has the extra clock functions: a timer, an alarm, a stopwatch, and a world clock for five time zones. Nice. The phone locator is more convenient to make it easy find the connected phone.

    Terrific smartwatch for the bargain whether for using with a cellphone and doing micro-workouts during the day or full workouts Full of features and a solid build.

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  2. Nadim

    The fit of this S4 watch is good, quite snug.
    Features are quite rich when compared to other leading brands of watches.
    It monitors sleep too and also has variety of fitness tracking.
    Screen brightness is very good in bright sunlight which is a must when outdoors.
    A really good value for money buy.

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  3. Curious4

    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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  4. Rubén

    I’ve only used it about a week, but I am very happy with it so far. It was easy to attach the wristband, download the app, & activate the warranty.

    One great feature is its impressive battery life. I can go days without needing to recharge, even with heavy use. The intuitive interface makes it easy to navigate between different functions, and the touchscreen is responsive and easy to use.

    Overall, the S4 AcuFit offers great value for its price point. It’s a stylish, functional accessory that helps me stay organized and motivated throughout the day.

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  5. Juan Z.

    I am training for a competition in a couple of months and wanted to take the plunge and use a smart watch to start tracking my fitness progress.

    I was surprised at how much more it can do, how well it looks, how conformable it is to wear, and the real time info it provides!

    I was originally planning to only use it for working out, but how seamlessly it connects with my iPhone and allows me to make answer, calls, see notifications, and track information has made it a part of my daily wear.

    The build quality is solid and sleek, battery is excellent and lasts multiple days, and the weather proofing has me running outside worry free, and the syncing with the app is seamless, it can even share the fitness data with the Apple native App.

    Cannot recommend it more, not sure why people would pay hundreds of dollars more for other brands.

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  6. T. W. N

    Mejor de lo que me esperaba, se sincroniza muy bien con el iPhone y con la app de salud aunque no reconoce los valores que tengas guardados en la aplicación. La correa es muy cómoda y la pantalla es perfecta!!

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  7. Nadim

    I have been using the watch for a few weeks now. It has basic functionality, heart rate, stress levels, sleep patterns.
    There is music and a weather app when connected to the phone which work really well.
    Vibrates when a call is received and also messages display on the watch.
    Battery life is very good, I have only needed to charge the watch once in 2 weeks.
    All in all a fabulous smartwatch for the price.

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  8. Juan Z.

    Having gone through S1-S3 smartwatches, this is the culmination of TOZO’s continuing efforts at competing with the smartwatch giants. It has all the functionality of the top brands at a fraction of the cost. Love the strap that neatly tucks in. And the battery just keeps going on and on. I hope TOZO can work on more watch faces but otherwise, kudos.

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