1、Multi Functional: This Bluetooth sound receiver transmitter is an sound device that combines sound decoding, Bluetooth reception and Bluetooth transmission with an effective range of approximately 50 meters. 2、Bluetooth 5.0: The Bluetooth transmitter receiver allows you to transfer all your favorite music from any phone, tablet, laptop or desktop to your sound system using Bluetooth 5.0 technology. 3、Receiver Mode: Receiver mode supports accepting Bluetooth sound signals and outputting sound from RCA and AUX; it supports playing sound files from USB flash drive and outputting sound from RCA and AUX. 4、Transmit Mode: Transmit mode supports the sound input by RCA, AUX, wirelessly transmitted to Bluetooth headphones, Bluetooth stereo and other devices via Bluetooth. 5、Sound Decoding: Bluetooth adapter supports decoding and wirelessly transmitting sound files from U disk to Bluetooth headphones or Bluetooth stereo and other devices via Bluetooth.