Features: 1. Easy to Use: Bluetooth-compatible version: 2.1. No software needed, just plug and play. 2. Wireless Bluetooth-compatible: The TV sound is transmitted to the home speaker via Bluetooth-compatible, so you don't have to worry about wire problems. 3. Enjoy the music: By transmitting TV sound to Bluetooth-compatible headphones via Bluetooth-compatible, you can enjoy the shocking sound effect alone in the middle of the night without worrying about disturbing others. 4. Wide Application: This Bluetooth-compatible transmitter is not only suitable for home use, but also for classroom lectures and conference speeches. 5. High Performance: Speak directly to the product's Mark air outlet, and you can send the speech sound to the Bluetooth-compatible speaker. You don't have to worry about your voice being too low for others to hear. Specification: Interface: USB Wireless Type: Bluetooth-compatible WIFI Standard: None Content: AUDIO Support HD: None Model Number: Audio Transmitter Supports paired Bluetooth-compatible stereo headphones/headsets to control play/pause, forward/backward Supports automatic pairing (no buttons) Supports pairing PIN code: 123400008888 Frequency range: 2.42 to 2.480 MHz (analog) spectrum Working current: Max 40mA Compatible with 30PIN Range: 10m Material: Plastic Color: Black Package Contents: 1 x Bluetooth Audio Transmitter 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.