Voice prompt: support One for two: support Pairing timeout shutdown: The pairing state lasts for 5 minutes and then shuts down. Low battery reminder: when the voltage is less than 3.2V, reminder 5 seconds, 3.1V shutdown Music control: Play pause: short press Previous song: - long press for 2 seconds song: + long press for 2 seconds Telephone control: the call: Short press when calling Hang up the phone: press when calling Redial without number: double-click the button, then short press to cancel the dial-out Led light shows: pairing: red and blue lights alternately flash Connection status: blue light flashes slowly (5 seconds 1 time) Low voltage: red light flashes (0.5 seconds 1 time) Product manual: BT version: 5.0 Interface type: 3.5mm Material: Plastic colour: Black Package Contents: 1 x Wireless Receiver Kit 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 picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.