Features: It allow you to make TV/CD player/MP3/speaker/car radio or anything else that is audio on your device. No driver needed, plug and play, convenient to use. No built-in battery, external power supply. Up to 15 meters long operating distance. High quality audio adapter Features of fast connection, low latency. Fully compatible, automatic matching, easy to operate and free to send/receive all audio. Built -in AEC echo and ANC elimination circuit chip, ensures pure sound quality. One button mode switching, blue indicator light for receiving, and red light for transmitting. Specifications: Material: ABS Input Voltage: DC/5V Input Interface: 3.5mm Transmission Signal Distance: 10-15m Item Size: 45 * 21 * 11mm / 1.77 * 0.83 * 0.43in Item Weight: 14g / 0.51oz Package Weight: 26g / 0.92oz Package Size: 10.2 * 6.8 * 1.8cm / 4.02 * 2.68 * 0.71in Package List: 1 * Audio Adapter 1 * Audio Cable 1 * Manual (English)