Bluetooth headset after running sports $ 8.32 Bluetooth specification: V2.1+EDR Class II Speaker diameter: 30mm Frequency range: 2400.0-2483.5MHz Transmission distance: 10m Sensitivity: -42DB Talk time: more than 10h Noise reduction: active noise reduction Talk time: more than 10h Charging time: 3h Listening time: 5h or more Standby time: 250h or more
