[Multi-function Bluetooth transmitter&receiver]In TX Mode: your music from a TV, CD player, , laptop to a Bluetooth headset or stereo (You can connect two devices at the same time); In Mode: will the music in your mobile phone or computer to the audio, so that you can enjoy HIFI CD freely The sound quality. Bypass mode: cable connection between TV and Speaker, you no need to plug/unplug any wires, switch it to other two mode. [Easy Set Up, Easy Use] Supports your setting after power failure. Supports AUX / 2 RCA audio output standards making it compatible with 99% of the on the market Bluetooth version: V5.3 Bluetooth protocol support: :A2DP AVRCP TX: A2DP Transmission distance: 10M (Open Area) Charging time: about 2.5H Charging voltage: DC 5V Audio output mode: RCA,3.5MM stereo audio interface Note:Without battery (Powered by power cable) Colour: Black Material: plastic Size: 110x60x26mm Package Contents: 1 * Bluetooth Receiver Transmitter 1 * 3.5mm Audio Cable 1 * USB charging cable 1 * RCA Audio 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.