Specifications:Model: RT02Technologies: BT5.0, A2DP, AVRCPOperation Range: Up to 10m / 33ftPairing name:RT02Transmit mode: red indicator lightReceiving mode: blue indicator lightDimensions: 32mm*17mm*8.5mmHow to use:1.Plug one end of the audio cable into the audio output of the TV and the other end into the audio of the RT02.2.Plug the RT02 into the usb (DC 5V) and confirm that it is in transmit mode (red light flash). The RT02 will automatically search for Bluetooth headset or Bluetooth speaker pairing.Use for home speakers/ car speakers, etcRT02 can help home speakers, wired headphones, car speakers, etc. without Bluetooth.Bluetooth connection with your phone. Key Description:"+": Long pre is to switch to the next song; short pre is volume +"-": Long pre is to switch the previous song; short pre is the volume-"M": Switch mode/pause/play/answer callNote: The button can only be used in receiving modeMode switchingLong pre the M button to switch:red light on means switching to Transmit modeblue light on means switching to receiving modeUse for computer:When you use it on your computer, Can be used to connect Bluetooth headsets or Bluetooth speakers. No need audio cable and no driver required, plug and play (only audio can't transmit data).How to use: Switch to the transmit mode, the red light flashes, and the Bluetooth speaker or Bluetooth headset is turned on at the same time, it will be automatically paired. After the pairing is succeful, the red light will be on.Use for other devicesWhen used on other non-computer devices with audio output, such as a TV, Can be used to connect Bluetooth headsets or Bluetooth speakers