--- product_id: 158242826 title: "NextStern™ M4 Smart Band Fitness Tracker Watch Heart Rate with Activity Tracker Waterproof Body Functions Like Steps Counter, Calorie Counter, Blood Pressure Heart Rate Monitor Touchscreen" brand: "nextstern" price: "303019₫" currency: VND in_stock: true reviews_count: 7 category: "Sports" url: https://www.desertcart.vn/products/158242826-nextstern-m4-smart-band-fitness-tracker-watch-heart-rate-activity store_origin: VN region: Vietnam --- # NextStern™ M4 Smart Band Fitness Tracker Watch Heart Rate with Activity Tracker Waterproof Body Functions Like Steps Counter, Calorie Counter, Blood Pressure Heart Rate Monitor Touchscreen **Brand:** nextstern **Price:** 303019₫ **Availability:** ✅ In Stock ## Quick Answers - **What is this?** NextStern™ M4 Smart Band Fitness Tracker Watch Heart Rate with Activity Tracker Waterproof Body Functions Like Steps Counter, Calorie Counter, Blood Pressure Heart Rate Monitor Touchscreen by nextstern - **How much does it cost?** 303019₫ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/158242826-nextstern-m4-smart-band-fitness-tracker-watch-heart-rate-activity) ## Best For - nextstern enthusiasts ## Why This Product - Trusted nextstern brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description HOW TO USE 1. Please charge before use! After charging, the watch will automatically turn on! 2. After the watch is connected to the phone, the watch will automatically update to the time of the phone, the watch does not need to be set! 3. Do not use the smart bracelet in sea water, hot water or warm water! 4. Please scan the QR code on the user manual to download the app. How to connect the phone to the watch (1). Please download the mobile app (2). Start the watch,Start the phone Bluetooth (3). Enter the mobile app to find the Bluetooth connection device function (4). Connect the watch to your phone mobile app (5). After connecting, the watch can monitor various sports data normall M4 Fitness Smart band: If you're a fitness freak and love keeping a track of the calories burnt, sleep cycle, and heart rate, and then the M4 Smart Band is what you need. This smart band works as a heart rate tracker, fitness watch, and an activity tracker. M4 waterproof Smart fitness Band compatible with Bluetooth or Heart Rate Sensor. It is compatible to devices having Bluetooth version 4.0 and below in smartphones, Tablets and PC's and also support Android. Functions: 1.Heart Rate Monitor 2.Sedentary reminder 3.Calories 4.Time 5.Alarm 6.Anti-lost 7.Distance calculation 8.Step Monitor 10.Call Alert 11.Wrist sense Pre-requisites for use: Your mobile phone Bluetooth version must be Bluetooth 4.0 or higher Android version must be Android 4.3 or above. Working: To connect the smart band to mobile phone, you need to connect the current mobile successfully via Bluetooth. ## Features - 1 Year warranty. - ☑️ Function: Blood pressure, heart rate , Blood Oxygen Monitors, Pedometer, Calories, Distance, Stopwatch, Sleep quality measurement, Call reminder, Alarm clock, Message calls notifications, Sedentary reminder, Remote camera control, Anti-lost, find the phone/bracelet, Water drinking reminder, Sedentary reminder, Social sharing (WeChat, Facebook, Twitter, Skype) - ☑️ Calls/text reminder: It will vibrate to alert you if your phone receives a phone call, text, SNS; You will never miss a call and a message; Sedentary reminder, when you focus on your work too long, it gives you a notice to relax - ☑️ All-day activity tracking: Track steps, distance, calories burned, active minutes, you can check daily activity and time on OLED display or APP - ☑️ HD Display Screen and Long Standby Time: High sensitive capacitive touch screen; 0.96-inch TFT HD LCD touch screen, there have four different operation interface for you to change, Resolution ratio: 128x64 pixel; 380MAH polymer lithium battery, standby time up to 180 hours after 1.5 hours fully charged ## Images ![NextStern™ M4 Smart Band Fitness Tracker Watch Heart Rate with Activity Tracker Waterproof Body Functions Like Steps Counter, Calorie Counter, Blood Pressure Heart Rate Monitor Touchscreen - Image 1](https://images-na.ssl-images-amazon.com/images/I/41Ven4Ou9GL.jpg) ![NextStern™ M4 Smart Band Fitness Tracker Watch Heart Rate with Activity Tracker Waterproof Body Functions Like Steps Counter, Calorie Counter, Blood Pressure Heart Rate Monitor Touchscreen - Image 2](https://images-na.ssl-images-amazon.com/images/I/415djyub%2BNL.jpg) ![NextStern™ M4 Smart Band Fitness Tracker Watch Heart Rate with Activity Tracker Waterproof Body Functions Like Steps Counter, Calorie Counter, Blood Pressure Heart Rate Monitor Touchscreen - Image 3](https://images-na.ssl-images-amazon.com/images/I/41pXIfCtJHL.jpg) ![NextStern™ M4 Smart Band Fitness Tracker Watch Heart Rate with Activity Tracker Waterproof Body Functions Like Steps Counter, Calorie Counter, Blood Pressure Heart Rate Monitor Touchscreen - Image 4](https://images-na.ssl-images-amazon.com/images/I/412y-2s25TL.jpg) ![NextStern™ M4 Smart Band Fitness Tracker Watch Heart Rate with Activity Tracker Waterproof Body Functions Like Steps Counter, Calorie Counter, Blood Pressure Heart Rate Monitor Touchscreen - Image 5](https://images-na.ssl-images-amazon.com/images/I/41IeSisbx7L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐ Nice band *by R***. on 11 October 2019* There is problem with it's battery sometimes ### ⭐⭐⭐ Battery back up is low *by A***R on 25 October 2019* MI Band battery Back up is low ,only 12hrs. ### ⭐ Not proper working *by K***R on 13 November 2019* Very bad --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vn/products/158242826-nextstern-m4-smart-band-fitness-tracker-watch-heart-rate-activity](https://www.desertcart.vn/products/158242826-nextstern-m4-smart-band-fitness-tracker-watch-heart-rate-activity) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-05-20*