Display type: AMOLED Display size: 2.15" Ultra-large HD AMOLED Display, Support Always on Displays. Display resolution: 415*505 pixels, 330 PPI, Up to 1000 nit Brightness Touch screen: YES Case material: Plastic bottom case + Middle frame spraying Button material: Aluminum alloy Buckle material: Plastic Material: Durable and comfortable fluoroelastomer strap. Width: 22 mm, Compatible with standard 22 mm quick release watch bands. Wrist Circumference: 130-235 mm Wrist Heart Rate Monitor, Pulse Ox Blood Oxygen Saturation Monitor, Proximity sensor, Accelerometer. Bluetooth version: BLE 5.2 Smartphone Compatability: Android 5.0 or ios 10.0 and above Operation temperature min: -20 C Durability Operation temperature max: 40 C Water resistance: IP 68 Battery capacity: 300 mAh Battery type: Li-Pol Typical usage modes, up to: 15 days Heavy usage modes. up to: 7 days Coutinuous Voice Calling: 365 mins Charging time: 1.5 Hours