Thinkfit Fitness Band – the motivation to get active!Functions: Tracking steps, Active time, Calories, Sleep monitoring, Time display, Selfie function, Silent wake alarm, Call incoming number, name display.Standby time: 5-7 days, using time: 3-4 days. Software Download: Zeroner Health from App store, Google Play or equivalent. Charging: Removable device plugs into USB. Rechargeable 75mAh LiPo battery. Compatibility: Most current phones on the market.