Screen Size: 1.39" TFT 360*360 Bluetooth Version: V5.3 Battery Capacity: 300mAh Battery Type: Lithium Polymer Battery Charging Time: 3 hours Standby Time: 40 days Using Time: Up to 12 days Watch Size: 50.3*39.4*13.1mm (without strap) Weight: 42.7g (with strap) Material: ABS/PC/Silicone