App: Wearpro Chip: Ruiyu RTK8762DK Heart rate sensor: BD1820 with release function Bluetooth dual Bluetooth: 5.0 Compass: Support Product process: Zinc alloy+IML Net weight of the body: 29.5 grams Screen size: 1.39 inches Screen resolution: 360 * 360 Screen type: IPS full angle color screen Screen material: explosion-proof tempered glass Total length of wrist strap: 210 millimeters Wrist strap material: silicone Head size: 42MM Band size: Band width 20MM Battery type: Lithium battery Battery model: 352228 polymer Battery voltage: 3.8V Battery capacity: 240mAh Battery life: 5-6 days of normal connection and 25-35 days of standby. (Connection usage depends on personal usage) Charging method: wireless charging Charging time: about 3.5 hours Functions: Bluetooth call, 6 sets of menu styles, support more than 300 dials, breathing training, custom dials, stopwatches, brightness adjustment, multi sport mode, real sleep, real heart rate, information push, remote music, remote photography, real-time weather, finding mobile phones (connected to mobile phones), Bluetooth music playback, password protection, calculator, split screen display, quick widget, air pressure, female assistant, massager, alarm clock, flashlight, power saving mode, Alipay, adding constant light selection, explosion-proof glass, multi taskbar, 156 sport modes, independent ring tones, do not disturb mode, blood pressure, red dot information, SOS alarm.