Oshen Watch or above; Android 4.4 or above Waterproof system IP67 dust proof, waterproof standard design Battery Long lasting lithium ion battery with 96 hors backup Dinension 36.3mm X 12.5mm Personal Alarm Function Highly supported, International Standard Oshen watch Review Features of Oshen Watch Heart Rate Monitoring Blood Pressure Monitor Modern display IP6/7 Waterproof Number of Steps Sleep Monitoring Calorie Monitoring Alarm Reminder Incoming Call QQ WeChat Display Bracelet in leather look (brown or black) Long Standby Technical Facts About Oshen Watch Smar twatch Long-lasting Lithium ion batteries. The Smar twatch is created with Aluminum. It can be easily attached with Android or IoS. The watch has tempered glass on it. The watch has a tractor to track heart rates.