1、TX MODE: Bluetooth transmitter receiver connects to non Bluetooth devices such as TV, PC and MP3 player via AUX, RCA jacks in TX mode and streams sound to headphones, speakers, and bar speakers. 2、RX MODE: 2 in1 bluetooth transmitter receiver in RX mode connects to wired speakers, headphones, and receives sound from smartphones via bluetooth and enjoys stable connectivity and stereo sound. 3、BLUETOOTH V5.1 CHIP: Equipped with the latest bluetooth chip and well designed software, the bluetooth adapter not only helps to upgrade old sound devices to bluetooth capability, but also gives you a CD like listening feast. 4、PLUG AND PLAY: Bluetooth 5.1 transmitter receiver supports 3.5mm AUX and RCA and can be inserted into a small memory card, allowing you to listen to music anywhere, anytime. Driver free plug and play. 5、LED DIGITAL DISPLAY SCREEN: Bluetooth AUX adapter with LED digital display screen, so you can clearly see the status of various operations. Support Bluetooth 5.1, low latency, noise reduction, improved speed and range. Item Type: Bluetooth Transmitter Receiver Material: ABS Model: For C39S Wireless Version: V5.1 Wireless Distance: About 10m/32.8ft Mode: Receive, Send Product Size: Approx. 70x70x23mm / 2.8x2.8x0.9in Function: Wireless Adapter, Small Memory Card Playback, AUX Connection, Dual Channel Connection 1 x Bluetooth Transmitter Receiver 1 x 3.5mm AUX Cable 1 x RCA Sound Cable 1 x Power Cord