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There's no need to worry about batter, this product adopts high density polymer battery, stand-by time up to 48 hours, and call time up to 6 hours. You can use it to remote control your smartphone to take photos, at anywhere and anytime, very convenient. Wristband design, free your hands.The best choice of sports fans: you can enjoy music during walking, running, driving, riding, cycling, jumping, hiking, skateboarding, jogging, camping and other all outdoors activities.You can also use it in office,at home and so on situations. Specifications: Condition: 100% Brand New and High Quality Material: Plastic Type: B20 Color: White, Blue, Black (optional) Watch Dial Diameter: Approx. 40mm/1.57'' Watch Dial Thickness: Approx. 24mm/0.94'' Watchband Length: Approx. 26cm/10.2'' Watchband Width: Approx. 2.2cm/0.86'' Power: 3W TF Card : Support (not included) Sensitivity: 360MV SNR (Signal to Noise Ratio): 80DB Charging Voltage: DC 5V Frequency Response: 120Hz-20KHz USB: USB 2.0 Built-in Battery Capacity: 500mAh Input Current: 500mAh Bluetooth: Bluetooth V2.1+EDR Weight: Approx. 170g Packing List: 1 x B20 Watch 1 x User Manual 1 x USB Cable Note: Please notice that the TF card is not included.