AUX Bluetooth Receiver Transmitter: Wireless life is more exciting, with no loss of sound quality all the way to listen. Bluetooth transmission mode (TX): Convert wired audio to Bluetooth signal and transmit it to Bluetooth device for output. Bluetooth receiving mode (RX): Receive Bluetooth signal and transmit it to wired audio via Bluetooth connection. Turn into a Bluetooth TV: Connect to the TV's 3.5mm audio interface and transmit the sound to the headset via Bluetooth, so you don't have to be afraid of disturbing your family when watching late at night. PS: Use in TX mode (TX) Turn into a Bluetooth speaker: Connect to a 3.5mm audio port, and the speaker without Bluetooth function can also be played wirelessly. PS: Use in transmission mode (TX) Fully charged once and used for 4 hours: built-in rechargeable lithium battery, once, can be used for 4 hours continuously when the battery is low, convenient and worry-free. Enjoy freedom 10m transmission: 10m long-distance transmission is continuously connected, and you can listen to the freedom in the corner. Product name: Bluetooth audio receiving and transmitting combination Battery capacity: 140Amh Bluetooth version: V5.0 Life time: 4H Bluetooth distance: less than or equal to 10M (open place) Charging: -USB 5V/0.5A Output connection mode: 3.5MM interface Input connection mode: 3.5MM interface for: Android, IOS system mobile phone and PAD, and all Bluetooth audio equipment, audio equipment with audio input interface color: black Material: ABS size: 59.5x22x12mm Package Contents:1 x Bluetooth receiver transmitter 1 x charging cable 1 x 3.5mm audio head Only the above package content, other products are not included. Note: Light 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.