Features:SMS, information, call reminders.Bluetooth synchronization.Remote camera, take photos by phone using the bracelet's remote control.Activity tracking, record your daily activity: steps, distance, time, calories; check and share your data at any time.Anti-loss, the bracelet will remind you with vibration when your phone is 5 m from you.When the Bluetooth is disconnected the watch alerts you.Sleep monitor, check the sleep trend chart to see your sleep time and quality of sleep.Sedentary reminder, place it to remind you to walk or exercise after a long break.IP67 waterproof, smart water bracelet (not for swimming or showering).Blood pressure, Spo2, Heart rate monitor ingUSB charging cableSpecification:Device model: M4 heart rate braceletBluetooth: 4.0Battery: Lithium-ion polymer 90mACharging time: 2 hours usage time: about 7 days standby time: about 15 daysWaterproof: Life WaterproofCompatible System: for IOS8.0 and above, for Android4.4 and aboveSynchronization range: 3 mMain fun