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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Availability:
20 left in stock
Arrives
Thursday, May 21
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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: Activity Tracker, Email, Text Messaging, Touchscreen
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
Operating System: NO
Additional Features: Activity Tracker, Email, Text Messaging, Touchscreen
GPS Geotagging Functionality: No GPS
Band Material Type: Silicone
Case Material Type: Liquid Silicone
Water Resistance Level: Waterproof
Sport Type: Indoor Sports/Outdoor Sports/Ice and Snow Sports/Ball Games Dance/Combat Sports/Other Sports
Closure Type: Buckle
Human Interface Input: Buttons, Touchscreen
Clasp Type: Hook Buckle
Supported Application: Message / Alarm / Weather / Bluetooth Calls / Health Data / Workout / Heart Rate / Stress / Blood oxygen monitor(SpO2) / Sleep / Relax / Music / Time / Settings
Water Resistance Depth: 1 Meters
Supported Satellite Navigation System: GPS
Controller Type: Touch Control / APP/ Button
Metrics Measured: Sleep Duration
Battery Capacity: 300 Milliamp Hours
Battery Cell Type: Lithium
Battery Average Life: 10 days
Battery Charge Time: 2 Hours
Battery Power: 300 Milliamp Hours
Screen Size: 1.78 Inches
Display Type: AMOLED
Resolution: 368 x 448
Compatible Devices: Android 9.0+ Devices、iOS 11.0+ Devices
Compatible Phone Models: IOS 9.0+ / Android 6.0+
Memory Storage Capacity: 128 MB
RAM Memory Installed: 128 MB
Brand: TOZO
Model Name: TOZO S4 AcuFit One
Target Audience: Unisex Adults
Age Range Description: All
Model Number: S4
Built-In Media: Charging Cable, Instruction Manual, Quick Guide, TOZO S4 Smart Watch
Wearable Computer Type: Smart Watch
Global Trade Identification Number: 61
Manufacturer: TOZO
Warranty Description: TOZO
Shape: Square
Style Name: Sports/Leisure
Color: Black
Band Color: Black
Connectivity Technology: Bluetooth
Wireless Compability: Bluetooth
Wireless Provider: du
Cellular Technology: Bluetooth
Communication Feature: Email, Notification, Phone Call, Text Message
Band Width: 22 Millimeters
Item Weight: 39 Grams
Item Dimensions: 6.46 x 4.5 x 0.75 inches
Band Length: 210 Millimeters
Warranty Type: Limited
Waterproof Rating: IP68
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, May 21
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.
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Top Amazon Reviews
Color: Black
I’m a spreadsheet guy, to a fault, and my wife regularly talks dirty to me by asking me to compare products for her. When my most recent smartwatch finally crapped out on me after 2.5 years (Mobvoi TicWatch 3 GPS), I waited to see what was going to pop up on my radar so that I could get started on my next spreadsheet journey. I am firmly entrenched in the Google ecosystem so it was going to be either the TicWatch 5 or the Pixel Watch 2… but neither of them were really what I wanted. The TW5 is bulky and expensive and the PW2 is too small… and, also, expensive. I knew there had to be a budget smartwatch on Amazon that could get the job done until the next TW and/or PW came out so I started looking. I stumbled on this one, the S4, because I recognized Tozo as a maker of premium quality yet budget-friendly earbuds. So, I took the leap and here’s my review after 10 days. Battery life: When you unbox your watch, there’s a sticker on the face that advises you to fully charge the watch prior to turning it on and using it. I connected the charger and the watch was already at 94%, so I turned it on and let it rip. That was last Tuesday afternoon (January 9, 2024); my watch died sometime in the middle of the night this past Tuesday morning (January 16, 2024) between 2300 and 0630. When I went to bed it was still at 9%. My TW, initially, held strong at about 48 hours before it needed to charge and, eventually, it trickled down to about 7 hours right before it died. This thing does exactly what I expect it to, which is to simply notify me of calls, texts and emails, just like my TW did, and it lasted 7 days strong on one charge. Also, from totally dead to 100% battery only took about 75 minutes. I am very happy about this. *5/5 UPDATE 01/28/24: I have had this watch for almost three weeks and I just charged it for the THIRD TIME today. Changing my battery life grade by giving it +1, so it is now *6 / 5. Accessories: The charging cable that the watch comes with is proprietary (bummer) and measures about 24.5 inches (WTF?). It is remarkably short. For comparison, the Mobvoi charger that my TW came with measures just shy of 36 inches. Additionally, the magnets that keep the charger attached to the watch are laughably weak. I could pick my TW up by the charging cable when it was attached and I couldn’t even MOVE the S4 itself while the charger was connected because the magnets aren’t strong enough to keep it in the right spot. *1/5, a one (1) only because they include the cable in the box, otherwise it would be zero (0). Continue reading to learn about the watch band… Comfort: The S4 comes with a high-quality silicone band with “Tozo” stamped on it. It’s very similar to what you might see on an Apple Watch, down to the band overlap going under the band to get out of the way. The watch itself, however, isn’t the most comfortable on the wrist and sits kind of weird, most likely due to how large it is. It is noticeably lighter than the TW3 though (for those of you who have one, or who were wondering), coming in at 1.4 oz compared to 2.3 oz (almost 40% lighter). *3.5/5 Screen: The 1.78” AMOLED on this thing is bright - like BRIGHT bright. Luckily, it has 5 brightness settings that you can easily select from, either directly on the watch or in the accompanying app. You can also change the screen time-out intervals in increments of 5 seconds, from 5 seconds up to 30 seconds. The colors aren’t oversaturated and they’re quite crisp. You can also turn on Do-Not-Disturb and/or Silent Mode at night to keep it from making noise when it's quiet. There really isn’t anything to complain about here. *5/5 Watch faces: The advert describes 100+ watch faces and as of right now (01/19/2024), there are a total of 246 - 3 of which are “custom,” meaning you can use a photo of your choosing as the background. The other 243 fall into categories titled, “Simple,” “Personality,” “Colorful,” “Pointer,” “Business Style,” and “Festival.” The sheer number is a bit overwhelming, but then again, so are most of the watch faces. It’s a WYSIWYG shop here: there are no customizable complications and the vast majority of the faces are either distractingly colorful or needlessly busy. The one that I’m currently using, called “Intelligence - Future,” has a comparatively subdued black and blue color scheme but there are some confusing inclusions and omissions. For example: there’s a battery icon at the top right of the screen but there’s also a battery percent reading in the face. Additionally, there are three placeholders for complications; two of them are in use (the previously mentioned battery percentage and heart rate) but the one in between them is empty. Again, there’s no way to select a complication to place there… it’s just a black circle. One of the most frustrating aspects of this watch so far (which is relative, of course) is that there is no option to make your own face or modify the ones that are in the Dial Center. I’ve searched far and wide to see if any savvy devs out there have figured out how to jack into this OS, or even knows what type of OS this thing runs, but so far it seems like no one has had any luck. Hey Tozo - give us a watch builder or at least the option to add/modify complications! *3/5 Processor and OS: Tozo advertises the S4 as having a “high-precision wear chip,” but there doesn’t seem to be any indication of what type of chip is actually running the watch. The same goes with the OS - my assumption is that it’s some kind of RToS, similar to what the One Plus Watch runs/ran, which explains how/why it's so responsive. Honestly though, it doesn’t really matter because it’s snappy and rarely stutters in day-to-day use. *5/5 Intelligent Message Notification: Coming from a WearOS device, I guess I was accustomed to a more robust notification system. Not that the S4 is lacking, because it will definitely let you know when you’ve received a message or email or phone call, but not being able to respond directly from the watch is kind of a bummer. It’s definitely not a deal breaker, but it would be nice to be able to use an on-screen keyboard or voice-to-text to quickly reply to texts and instant messages. In the Tozo Health app, you can create a few canned responses if you decline a call but they can’t be used to respond to any other type of communication. Additionally, you need to be sure to go into the Notification and Reminders section of the app, select “App messages,” then manually select which apps you give permission to notify you otherwise you’ll likely miss them until the next time you look at your phone. Another aspect that took some getting used to is the notification icons that the watch uses. It recognizes FB Messenger and shows the blue bolt-looking thing; it also recognizes Outlook and shows the blue email icon, but it uses a generic one for text messages that looks like a 4-leaf clover. This is just me being picky, I suppose. The main factor to remember here is that this thing concurrently notifies you when notifications come in. My watch vibrates, literally, at the same time as my phone. Also, the vibration motor in this thing is SUPER strong so you will definitely know when it’s going off. I couldn’t say that about my TW. *4/5 Bluetooth Calling: I’ve only used this feature once so far, and it didn’t sound great (the caller’s voice was tinny and distant), but I was outside and the ambient noise level was pretty high. Obviously, this isn’t going to replace a BT or wired headset, or the speakerphone on your device - but to answer a call in a pinch until you can get to your phone, it is totally passable. You can add up to 10 frequent contacts in the app which will sync to your watch so that you can initiate a call if your phone is close by but out of reach. That’s a pretty cool feature that I don’t recall my TW having. *4/5 Fitness Features: Gonna be totally honest - I didn’t buy this watch for the fitness features so I haven’t tested them, nor do I suspect that they would be accurate anyways. Standard on the watch, when swiping right to left, are the HR monitor, Sleep monitor, Stress monitor, Weather screen, and Activity monitor. Based on the comfort of the watch, I’m not interested in wearing it to bed to test the sleep monitor nor would I trust it to keep track of my HR. *X/X Software quirks: Some of the stranger software quirks that I’ve noticed so far are… *The rotating crown employs a satisfying mechanical haptic "bump" when you rotate it, and it does a serviceable job of assisting with menu and screen navigation but when the display is on, rotating the crown will cycle through the five watch faces that live on the device. So, if you’re wearing a long sleeve shirt, sweatshirt, or have short hands and put them in your pockets, you may inadvertently swap your watch face. I’ve done it a few times and it’s becoming quite annoying. *The screen has to stay on, and on the timer module, for the timer function to continue counting down. I recently set a timer for 5 minutes then clicked on the crown to return to the home screen and went about my business. It took me quite some time to realize that the timer should have gone off long before then and when I went back into my watch, the timer had reset / the function ended. Overall: For the price, and the features, I couldn’t be more pleased with this purchase. The S4 does exactly what I need it to, which is to help me keep my eyes off of my phone - and tell me the time every once in a while. It’s taken a little getting used to the shape (i.e., rectangular [APPLE - BARF!!!] vs circular [Google - HOORAY!!]) but, to be honest, it works much better for reading notifications and not having to worry about square notifications getting cut off by round bezels. The battery life is INSANE, the screen looks great, and it stays connected to my phone consistently. Anyone looking for a high-quality, budget smartwatch, should definitely consider this one.
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Reviewed in the United States on January 20, 2024 by Dustin
Color: Gold
UPDATE: Tozo reached out to me after my initial review. Due to some of my concerns, they thought perhaps I had received a defective unit and offered to replace it for me. I accepted their offer and have received the replacement. Due to their diligence and superb customer service, I have upgraded my rating to a 5 star. Good customer service is so rare these days and Tozo has gone above and beyond to make me happy. I would definitely recommend Tozo. I've only had this watch a day now, but one of the main things I was wanting a smart watch for seems to be working as it should with this one ... sleep tracking. I have back and hip issues that prevent me from being able to sleep thru the night. After a few hours I have to get up due to the pain and sometimes it's an hour or more before I can get back to sleep. And since my nighttime sleep is usually less than optimal, I nap thru the day. Today I took a nap for a little over an hour and this watch captured it precisely. I tried a different watch last week and returned it after a couple of days. It would not record any sleep during the day. Plus the step count on that previous watch was WAY off (almost 300 steps to go from one room to another in my house ... I don't think so). This Tozo watch matched my heart rate exactly to the BP monitor I use. The steps seem reasonable and I don't think just moving my arms (while sitting at the computer, or working in the kitchen) affect it. So far the battery life seems very good. The watch I returned last week used almost 30% in one day. Granted I was playing around with it a lot just learning how to use it, but I've also spent a lot of time with this one and the battery is still 92% after 24 hours. I saw in the comments some people referred to this watching have a built-in GPS ... that is NOT the case. The GPS that is used is from the phone. Turn the GPS off on the phone and there's no GPS. So people shouldn't buy this watch expecting to have GPS based on some of the reviews. No where in the description on Amazon does it say anything about GPS being built in. I've never had an Apple or Samsung watch (and probably never will) so I can't compare this watch to either of those. For my needs/wants and the price point I'm very happy with my choice.
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Reviewed in the United States on July 1, 2024 by p1mkw
Color: Black
It's definitely a low-priced smartwatch that lacks many of the bells and whistles of the far more expensive ones out there, but I didn't expect Apple, Samsung, or Google quality out of this when I ordered it. I wanted a basic model with a few functions that would be useful to me. The size is comfortable enough, being neither too bulky for comfort nor too small to read the screen. The instructions are clear enough, and the software side of the setup is easy. However, the default band that came with it is absolute trash. I spent days struggling to try to install it. The silicone material is simply too inflexible to fit both sides of the pin into the holes provided, and I even enlisted the aid of others who fared no better. I ended up buying a replacement band made of stretchy, flexible nylon, and when it arrived? I had it snapped into place within a few minutes and have been able to make use of the watch only since that point. I don't regret the purchase, but would have ordered the separate band at the same time if I'd been aware of the issue. After all, it was still far cheaper than the big name alternatives to get it and the watch band for the features I actually cared about getting. One final note, this listing says it is an S4, but the watch came in a box that labeled it as an S6. That isn't a complaint, just clarification. I have to assume it means I got a more recent model than expected.
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Reviewed in the United States on February 7, 2026 by Lilith Isley