Specifications: Model: AQ 126 Display Size: About 0.86″ OLED Screen Band Material: Soft TPU Bluetooth: V4.0 Power supply: 3.7V rechargeable battery Battery Type: Lithium-ion Charging Interface: USB Port Charging Time: 1-2 hours Stand By Time: 4-5 days Application system : iOS 7.1 & above, Android 4.4 & above Features: Heart rate monitor | Blood Pressure Monitor | Time | Date Calorie | distance | Step pedometer | alarm alert | SMS alert Call alert | anti-lost | sedentary alert | camera remote shoot About Functions: Call Alert: The tracker vibrates and the call is displayed on the screen when there is an incoming call. Sedentary Alert: Set reminders for periods of time of inactivity. Alarm Alert: Set silent alarms on the tracker to wake you up and not disturb your partner. SNS Alert: Receive notifications from other apps. SMS Alert: Read incoming text messages on your tracker screen. Find Phone: Set the tracker to locate your phone by making the phone vibrate or ring.