Main features:Firmware language: English, Korean, Japanese, German, Spanish, French, Italian, Portuguese, Arabic, Russian, Dutch, Indonesian, Hindi, Polish, Turkish Apk language: English, Korean, Japanese, German, Spanish, French, Italian, Portuguese, Arabic, Russian, Dutch, Indonesian, Hindi, Polish, Turkish Apk name: Tefiti Battery: 200mah Charging time: 2 hours Standby time: 21 days , Normal use: 10 day Main screen: 1.28-inch IPS color screen Resolution: 240 * 240 Touch screen: full touch RAM/ROM: 64M+160KMain Functions:Health Monitoring: Sleep Monitor,heart rate, blood pressure Message content push: Phone call, SMS, Social Media Information push and display. Frequently Asked QuestionsQ:Is the heart rate/Blood Pressure Monitor accurate?Why I measured an object can still get a value?Is it fake? A:It is the phenomenon that all smart watches will have.All measurements depend on sensors and algorithms and have certain errors. So is iwatch, huawei watch and xiao mi band. The principle of wearable device measurement is completely different from that of medical equipment. It is only for sports and fitness reference, thank you. Q:How to change the time of my device? A:Please synchronize the device with your phone through bluetooth to calibrate time. Q:Is it waterproof?Can I wear it to take a shower or swim? A:IP68 waterproof ,can swim ( please do not touch hot water )