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Description features: model : f910 stereo headset bluetooth version: v4.0+edr frequency range: 2.4ghz-2.48ghz transmission power: class 2 transmission distance: 10m operating current:≤25ma standby current:≤2ma charging time: 1-2h talking time: up to 4h standby time: up to 150h operating voltage: 3.6v suitable for cell phones and tablets with bluetooth wireless stereo bluetooth headset helps to reduce radiation while answering calls allows you to conveniently answer calls or listen to music while doing sports supports multipoint technology allowing to connect two phones at the same time