Features: 1. Easy to Use: Bluetooth-compatible version: 2.1. There is no need to install any software, plug and play.2. Wireless Bluetooth-compatible: The TV sound is transmitted to the home combined speaker through Bluetooth-compatible, so there is no need to worry about the trouble caused by wiring.3. Enjoy the Music: By transmitting TV sound to Bluetooth-compatible headset through Bluetooth-compatible, you can enjoy the shocking sound effect alone in the dead of night without worrying about disturbing others.4. Wide Usage: This Bluetooth-compatible transmitter is not only suitable for home use, but also for classroom speeches and conference speeches.5. High Performance: Speak directly to the product's Mark air outlet, and you can transmit the speech sound to the Bluetooth-compatible speaker. There is no need to worry that is too small to be heard by others.Specification: Interface: USBWireless Type: bluetooth-compatibleWIFI Standard: NoneContent: AUDIOHigh Definition Support: NoneModel Number: Audio TransmitterSupport paired Bluetooth-compatible stereo headset/headset to control play/pause, forward/backwardSupport automatic pairing (no keys)Support pairing pin code: 123400008888Frequency range: 2.42 to 2.480 MHz (analog) spectrumWorking current: 40mA maximumCompatible with 30PINOperating range: 10mMaterial: plasticcolour: blackPackage Contents: 1 x Bluetooth Audio TransmitterOnly 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.