TOOGOO(R) 2 in 1 Bluetooth Transmitter & Receiver Wireless A2DP Audio Adapter Portable Audio Player Wireless Adapter Aux 3.5mm Using the matchbox-size unit is just as easy as pie. The transmitter mode and receive mode are simply one-button switchable. Standard 3.5mm audio socket and cable enable to connect to most modern audio device. Small and portable. Simple use, perfect sound quality.