Note:Only android phone can use Storage capacity 4GB Operating system RTOS Matching system Android 6.0 and above Screen size 1.39 inches Screen resolution 454*454 pixels Screen type AMOLED display Waterproof function Waterproof grade 5ATM (50 meters waterproof), waterproof grade IP68 Positioning function support, GPS+GLONASS+Galileo+Beidou 110 sports modes Support for storing songs Sensors Heart rate sensor, acceleration sensor, gyroscope, ambient light sensor, barometric altimeter, geomagnetic sensor, capacitance sensor Connection method Battery type: Built-in 402mAh lithium-ion polymer safety battery The theoretical working time can be up to 14 days Sleep blood oxygen is often on for 5 days GPS exercise for 25 hours Charging method: magnetic charging Product material Case: 316L stainless steel Strap: Viton strap Product size 46.4*46.4*10.9mm product weight Without strap: 45g Including strap: 76g Other parameters Endurance model: wear all day, turn on smart heart rate detection, turn on night sleep detection packing list Watch x1 Charging base x1