1. Bluetooth version: Bluetooth 4.0
2. Compatible system: IOS 7.1 and above, Android 4.4 and above
3. Control: Button
4. Main functions: step counting, calorie consumption, distance, number of steps, automatic sleep monitoring, call vibration reminder (caller number/name display), information display, alarm clock reminder, anti-lost mobile phone, remote camera, etc. 5. Screen size: 0.49" OLED
6. Battery capacity: 50mAh polymer lithium battery