[2-in-1 Bluetooth 5.4 Audio Adapter and Built-in Microphone] Bluetooth transmitter(TX Mode) allows you via 3.5mm cable to transmits audio from TVs, PCs, airplane entertainment to Bluetooth headphones, earbuds, bluetooth speakers. Bluetooth Receiver(RX Mode) connected your smartphone to wired speakers/earphone through Bluetooth. [Dual Link, Share Your Happiness] The Bluetooth transmitter can be paired with two wireless earphones or Bluetooth speakers at the same time in TX mode. In RX mode, you can connect to the Bluetooth of two mobile phones at the same time. You can share audio with your friends and lovers. Note that audio latency will be amplified in dual mode, expecting a high latency of 200ms. [Wide compatibility]: With a dual 3.5mm adapter, the Airplane Bluetooth Transmitter ensures compatibility with any aircraft device. It also connects seamlessly to home TVs, iPads, computers, treadmills, and gym equipment with a 3.5mm jack or AUX output. Additionally, it pairs with Bluetooth headphones (like AirPods) and Bluetooth speakers, providing convenient and immersive audio experiences in various environments. Colour:Black Material:ABS Package Contents: 1 * audio adapter 1 * airline adapter 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.