Features: 0.95-inch AMOLED color screen, resolution up to 240*120, saturated color. Supportintelligent heart rate detection, autonomous heart health management. Equipped withIR (infrared light) technology to monitor sleep, accurately identify 6 types of typical sleep problems, provide 200+ suggestions for improvement and personalized sleep services. Support 50 meters waterproof,recognize a variety of swimming postures, and record calories, strokes times, stroke frequency, speed, distance, average SWOLF and other data. Provide running performance evaluation to help you adjust your exercise intensity. Supportsmultiple sport modes. Simple and lightweight, detachable strap, skin-friendly material for a more comfortable wearing. Parameters: Screen: 0.95 inches AMOLED display, color screen Resolution: 120*240 pixels BT: BT 4.2 BT Frequency: 2.4GHz BT Distance: 10m NFC: Not support System: Compatible with Android 4.4 / iOS 9.0 and above Sensor: 6-axis inertial sensor (acceleration sensor, gyro sensor), optical heart rate sensor, infrared light wearing detection sensor Battery: 100mAh (theoretical) Charging Interface: 2 PIN Working Time: 5-12 days (theoretical) Charging Time: about 100min Standby Time: about 15 days (theoretical)