Features: 1. Easy to use: Bluetooth compatible version: 2.1. No software installation required, plug and play. 2. Wireless Bluetooth compatible: The TV sound is transmitted to the home combination speaker via Bluetooth compatible, so you don't have to worry about the trouble caused by cables. 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 speech and conference speech. 5. High performance: Speak directly into the product's Mark air outlet, and you can transmit the speech to the Bluetooth compatible speaker. You don't have to worry about the voice being too weak to be heard by others. Specification: Interface: USB Wireless Type: Bluetooth Compatible WIFI Standard: None Content: AUDIO Support High Definition: None Model Number: Audio Transmitter Support paired Bluetooth compatible stereo headphones/headset to control play/pause, forward/backward Support automatic pairing (no buttons) Support pairing PIN code: 123400008888 Frequency range: 2.42 to 2.480 MHz (analog) spect Working current: 40mA maximum Compatible with 30PIN Operating range: 10m Material: Plastic Color: Black Package Contents: 1 x Bluetooth Audio Transmitter The above package content only, 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 +/- 1-3 cm.