Hiwatch Black Large Charge Android System 4.3 Bluetooth 4.0 Wireless Activity Smart Wristband TW64 WARRANTY: Hiwatch is a professional seller in selling watch wristband, we offer Premium after-sale service. a. 2 years warranty. b. 1 months hassle-free return policy.c. Seller pays for return if item is DOA or not as described. Fulfilled by amazon with fast shipping. Accurately track all-day stats like steps taken, distance traveled, calories burned, stairs climbed, and active minutes. Get call notifications right on your wrist;Access real-time run stats like time, distance, and pace to stay on track. Please update the version of APP "Movnow plus". In order to keep the bluetooth connection steady, please make sure the wrist band is fully charged and kept at the available distance of 5 meters. Sync stats wirelessly and automatically to your computer and over 120 leading smartphones See daily stats, time of day, and exercise mode with a bright OLED display Monitor your sleep automatically and wake with a silent alarm