Receiver mode: Wirelessly streams audio from your Bluetooth-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones (Only support to be paired with one Bluetooth receiver). Transmitter mode: wirelessly streams audio from your non-Bluetooth TV, home stereo system, or CD player to your Bluetooth headphones or speakers. Switch between transmitter and receiver modes with the simple flick of a switch. Bluetooth Adapter has got powerful wireless audio streaming capabilities. It features Bluetooth 5.0 chip to ensure high fidelity transmission of Bluetooth audio signal for music streaming to those speakers or home stereo systems that doesnt have the capability.Slip it into your backpack or laptop bag and take it on-the-go without the slightest effort. Switch mode: (1) RX: Receive mode, indicator: blue LED (2) TX: Transmit mode, indicator light: red LED Model: KN321 Size: 44 x 44 x 12mm Charging time: 2 hours Package Contents: 1 x Bluetooth 5.0 audio transmitter/receiver adapter 1 x Micro USB power cord 1 x RCA cable 1x 3.5mm auxiliary cable 1 x user manual