Sensor and module Heart rate sensor: Photoelectric heart rate sensor Bluetooth chip: Nordic Bluetooth chip(Bluetooth 4.0 BLE) Sensor: Kionix Gravity-sensor App OS IOS 7.1 above / Android 4.4 above Functions 24 hours real-time heart rate monitor, Recording Multi-sport modes, Connected GPS, Guided breathing, Fitness level of heart and lung, Multiple watch face style switch, All-day activities recording, Auto sleep tracking, Call alert +Hang up, Weather alert, Music control, Remote shoot, SMS/SNS alert, Sedentary alert, Alarm alert, Anti-lost. Display Screen display: 0.96 display Screen type: OLED Operation method: single touch/full touch with touch Button Waterproof IP67 Life waterproof, rain-proof, sweat proof, moisture proof, but we suggest not wear during swimming or shower. Size 240*16*11mm Material Strap material: TPU+TPE Strap colour: Black, Blue, Red, Green, Purple. Battery specification Battery type: lithium polymer battery capacity: 65 mAh Duration: 10-15 days Charging ways: USB charging time: 1-2 hours Storage Record 7-day detailed sports and sleep data. Record personal sports data per week, month and year. Standard Packaging 1 x smart bracelet, 1 x user manual, 1 x packing box.