TEGAL 2 in 1 USB Powered Bluetooth 5.0 Transmitter This extremely portable, lightweight wireless audio transmitter & receiver is an ideal wireless audio solution for a wide range of situations and uses. Transmitter mode: Wirelessly streams audio from your non-Bluetooth TV, home stereo system. - Receiver mode: Wirelessly streams audio from your Bluetooth-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones. - Mode switching:1). If the device has been in a mode for a long time, it needs to be reenergised twice to switch to another mode.2). If the device has just switched mode, you want to immediately switch to another mode, you only need to reenergise once. - Pairing method: RX mode:Pairing name: KN320, find KN320 in the Bluetooth settings of the phone to pair. The blue light flashes during the pairing process, and the blue light stops flashing after the pairing is successful. Connect the product to the audio device with a 3.5 audio cable. - TX mode:TX mode will automatically search for other Bluetooth receiving devices (such as Bluetooth headset, Bluetooth speaker, Bluetooth receiver, etc.), the red light flashes during pairing, and the red light stops flashing after pairing succeeds. Connect the product to a device such as a TV with a 3.5 audio cable/RCA audio cable. - Included1 x TEGAL Bluetooth USB Adapter1 x 3.5mm Audio Cable1 x User Manual* Smart phones and other devices are not included.