2 in 1 Transmitter Receiver: transfer audio from non-Bluetooth devices (such as TV, computer and airplane entertainment devices) to Bluetooth headphones or speakers; Receiver mode: transmits audio from a Bluetooth audio source (smartphone, tablet, TV/Bluetooth computer) to a non-Bluetooth headphone/speaker/stereo for car/home via a 3.5mm audio cable. Note: If you want to connect to your TV, we recommend you use the charger for power supply and then the audio cable to connect to the TV, otherwise it cannot be connected to use. Latest Version of Bluetooth 5.4: Lower latency, more stable connection and clearer sound quality thanks to Bluetooth 5.4 technology, which maintains perfect synchronization between picture and sound. Maximum range up to 10 metres. It is recommended to use an audio cable instead of a USB cable if you use a USB for the audio input directly and then start the decoder delay. One-click mode switching: simply press a button to quickly switch between transmitter and receiver mode. When the Bluetooth adapter is turned on, the red light for transmitter mode and the blue light for receiver mode. Wireless music call: pair it with your smartphone and enjoy wireless CD music. Easy to use: Very easy to set up. Plug and play PC automatically connects to the saved device. The Bluetooth USB transmitter is small and very portable. Color: black Material: plastic Package Contents: 1 * Bluetooth 5.4 Transmitter Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.