The language is automatically changed according to the language of the mobile phone system and supports 10 languages: Simplified Chinese, American English, European Spanish, European Portuguese, French, German, Russian, Italian, Japanese, British English. APPs and OS: Worldwide Languages APP 'Huawei Health' for Android 4.4+/iOS 8.0+ For Bluetooth: 4.2, compatible with 4.0/4.1 Screen: 0.95 Inch AMOLED Color Touch Screen, Default Band Face Theme changing as Constellations Functions: Some of below functions need set in APP to work Call: Remind/Refuse Pulse: Continual pulse heart rate monitor Realtime 1 second, Night Sleep Care Infrared Detect Mode Message/APP: Remind/Show message, customize apps permission Sport: Time, Calories, Steps, Distance, Pace, Even Recognize Swimming Posture Alarm: Smart vibration Sleep: Auto track, Professional Multi-Pattern such as snap, TruSleep by CDB, Harvard Convenience: Lift wrist to show, sedentary alarm, etc. Swimmable: 5ATM(Swim or Shower in not-hot water), show swimming time and calories Strap: Streamline Texture, Skin Care, Nimble Design, Detached Without Screwdriver Standby: Magnet dock charging, Slight Using 14day, Scientific Sleep ON 6day Sensors: 6-Axis Inertial Sensor, Seperate PPG Sensor, Infrared Detect Sensor Size: 23g, Strap 126mm+95mm, Main Body 43mm x 17.2mm x 11.5mm Include: Band, Dock, Cable and Manual(SC)