1.53", Resolution: 360x360, Bluetooth 3.0 Audio / 5.4 APP, APP Support RDFit, Memory 64Mb, IP68, Input Standard 5V/1A, Battery Capacity 3.8V/315mAh Polymer battery, Usage Time About 4 days, Standby Time Standby with screen off for 30 days, Charging Time About 4 hours, Wireless charging, Bluetooth calls, Call reminders, Call logs, Dial pad, Pedometer, Message alerts, Stopwatch, Music control, Play Bluetooth music, Photo control, Find my phone, Alarm, Weather, App watch face notifications, Voice assistant, SOS, Sleep monitoring, Heart rate, Blood pressure, Blood oxygen, Sedentary reminders, Water drinking reminders, Steps tracking, Exercise distance tracking, Calorie consumption, Multiple sports modes, NFC door access, Product Material Zinc alloy ABS silicone