This USB receiver and transmitter can pair with devices and the built-in microphone can be used to answer hands-free calls. The 2-in-1 transmitter receiver can be used as a receiver in car audio system, and as a transmitter when used in a TV or computer. Features -Color:Multi -Material:Plastic -Size:5.50X2.00X1.00cm/2.16X0.79X0.39in -Version: 5.3 -Interface: 3.5MM/USB -Transmission rate: 24Mbps - With 5.3 chip, can realize faster speed and more stable transmission. - Allowing your speaker or headphone to receive signal from your device. - When the game console host itself does not , and it can connect with headphones, speakers, and speakers through a adapter. - It is perfect for watching video, listening to music, playing games, etc. - workmanship, reasonable structure, professional and practical, can bring you convenience. Package list: 3 x Wireless USB Adapter 1 x Cable