This product is set to receive and transmit, two-in-one Bluetooth device. Thisproduct is simple,which is able to launch and receive audio signal freely. Through Bluetooth reception mode you can send the phone/Tablet music to the traditional home audio equipment,It is more convenient to send Computer/TV to the Bluetooth speaker or Bluetooth headset through the product Bluctooth launch mode. This product has built-in rechargeable battery, which has long battery life. It solves the limitations of audio equipment perfectly and extends a variety of audio equipment transfer function. The actual object may have color difference due to different light or display Bluetooth version: 5.3 Product name: Bluetooth audio receiver and transmitter Bluetooth protocol: A2DPP AVRCP Frequency range: 2.402GHz-2.480GHZ Working distance: about 10 meters Input: AUX+USB Battery capacity: 3.7V 200maH Working time: ≈6H Charging voltage: DC-5V Charging time: ≈2H Frequency response: 100Hz-20kHZ Output: AUX Colour:Black Material:ABS Package Contents: 1 x Bluetooth Adapter 1 x 3.5mm Audio cable 1 x Type-C charging cable 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.