Features: 0.96 OLED screen with backlight, touch to operate. Comfortable TPU strap with PC case. Advanced Nordic chip, BT4.0 transmission technology. IP68 water-proof for: hand washing, rain etc. 70mAh rechargeable battery, 5 days long standby time. Multi-Functions: Heart Rate Monitor, Pedometer, Distance, Calorie, Sleep Monitor, Call Remind, Alarm, Notification Low Battery Indication etc. Compatible with IOS 7.1 Android 4.4 or above devices. Support 9 kinds of language: English, French, German, Italian, Thai, Japanese, Russian, Spanish, Simplified Traditional Chinese. Note: Before usage, please download app by scanning the QR code(in User Manual) to install the app.