Bluetooth call support, make/answer/refuse calls. – strap can be replaced, supports milan/nylon/silicone/nk sport straps, etc. – healthy care smart watch: blood pressure/heart rate/sleep monitor/sedentary reminder, etc. – multi sport modes: abdominal curl/table tennis/basketball/badmiton/climb/cycling, etc. – call/message notifications: wechat, qq, twitter, facebook, whatsapp. – other function: music control/remote photo taking/anti-lost/find phone/alarm clock/sound recording/stopwatch/calculator/calendar.