AUX Bluetooth receiver transmitter: wireless life is more exciting, without loss of sound quality all the way to listen Bluetooth transmission mode (TX): Convert wired audio into Bluetooth signal, and transmit it to Bluetooth device for output Bluetooth Receive Mode (RX): Receive Bluetooth signal and transmit it to wired audio through 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 are not afraid to disturb your family when watching late 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 transmit mode (TX)<br><br>Fully 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 combo Battery capacity: 140Amh Bluetooth version: V5.0 Life time: 4H Bluetooth distance: less than or equal to 10M (open place) Charging method: Micro-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 colour: black Material: ABS size: 59.5x22x12mm<br><br>Package Contents: 1 x Bluetooth receiver transmitter 1 x charging cable 1 x 3.5mm audio head<br><br>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.