Bluetooth transmission distance 5m Support Bluetooth hands-free call function Support Bluetooth A2DP stereo Support answering, hanging up, rejecting, calling back and other telephone functions Supports Cancellation and Noise Suppression () technology during calls Type: Audio Adapter Bluetooth standard: 5.0 Interface: 3.5mm Frequency response: 20-20khz Lithium battery: 250mA/h Charging time: about 2.5 hours Working hours: about 8-10 hours Material: ABS color: Black Package Contents: 1 x Bluetooth Receiver 1 x USB charging cable 1 x 3.5mm audio adapter cable 1 x 3.5mm adapter 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.