Compatible system iOS/ android function heart rate, ecg, blood pressure, blood oxygen, multiple sports modes: Walking, running, cycling, swimming, hiking, basketball, badminton, table tennis, football. Altitude, air pressure, Uv, weather (push through the network) step, stopwatch, remote photograph, music control sleep monitoring, sedentary reminder, drinking reminder, information viewing, etc. (Available after bluetooth connected) app language Russian, Turkish, Hebrew, German, Italian, Japanese, French, polish, Thai, simplified Chinese, traditional Chinese, English, Portuguese, Spanish, Arabic device supported language German, Russian, French, Japanese, Spanish, Italian, English, Portuguese, Arabic, Thai, Chinese available language of user manual (neutral or dt no. I available)neutral: Chinese, English dt no. I: Russian, German, Italian, Japanese, French, Chinese, English, Spanish app (neutral or dt no. I available)neutral: Fun do dt no. I: Dt no. I chip Nordic nrf52832 (512kb+64kb) heart rate sensor zhanheng bluetooth4. 2 waterproof craftsmanship zinc alloy + pc plastic product weight 59g screen size 1. 54 resolution 240x240 screen type tft colour screen material tempered glass wristband material silicone, steel strip battery type lithium battery model 402530p battery voltage3. 7v battery capacity230mah battery capacity standby for 20 days, normal connect i on for 5-7 days (depending on personal use) charging method magnetic charge charging time around 2h colour of strap black or silver certification fcc, ce, rohs, battery certification product weight rubber 93g, steel 116g.