Transmitter mode:Wirelessly transfer audio from non-Bluetooth TVs, home stereo systems or CD players to Bluetooth headsets or speakers.| Receiver mode:Wirelessly transfer audio from a Bluetooth-enabled phone, tablet or computer to cable stereo, speakers or headphones.|compatibility:This receiver transmitter adapter can be used in your computer, laptop, home stereo system, headset, smartphone, MP3 player, CD loss, etc.| Portable:Put this transmitter and receiver in your backpack or laptop bag and take it with you without any effort.| Mode switching: 1. If the device has been in a mode for a long time, it needs to be re-instered 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 re-insert once. | Receiving mode: used in non bluetooth home audio, wired headphones, car audio, etc..How to use: Power on the product by inserting the usb in power adapter and connect the 3.5 audio cable to your home audio, headphones, car audio . Open the Bluetooth settings in the phone, search for the pairing name: KN320 for pairing.The blue light flashes when pairing,the blue light is always on after pairing is successful. |Transmitting mode: Use on without Bluetooth TVs, computers, mp3s, etc. . How to use: Power on the product by inserting the Dongle into Power USB Port and There is no need to install the driver, but it needs to be connected with 3.5 audio cable into aux port of device. It can only transmit audio and cannot transmit data. Confirm the transmitting mode (red light). The red light flashes when pairing, and the red light is always on after the pairing succeeds. The product will automatically search for the Bluetooth headset, Bluetooth audio, Bluetooth receiver and other devices next to it.