Description: Transmitter and Receiver: The 3.5mm cordless aux adapter supports both transmit and receive, TX RX modes, easily and simply upgrade your old speakers or car audio system to compatible cordless audio. Stable Connection: With upgraded 5.1 technology, the wireless 3.5mm transmitter receiver can reduce power consumption and provide fast and stable transmission. Support AAC and SBC audio decoding to bring you clearer sound quality, low latency. Easy to Use: The headphone transmitter receiver is very easy to install and use. Just plug the car aux adapters into the AUX port of the receiver or transmitter, then press and hold the multifunction button for 3 seconds to power on and ready to pair. The audio adapter will automatically pair and connect with your devices. Wide Compatibility: This car transmitter receiver is compatible with devices with 3.5mm interface, the receiver mode is used for car audio, wired speaker, home speaker, speaker amplifier, earphones, etc., and the transmitter mode is suitable for computers, projection instruments, power amp, headphones, speakers, etc. Compact and Portable: The compact design of this transmitter and receiver saves you space, easy to carry and use. Specification: Material: PP Charging time: 2 hours Use time: 4-10 hours Battery capacity: 200mAh Size Chart: 8.15cmx10.92cmx2.5cm/3.21inchx4.30inchx0.98inch Package Includes: 1 AUX Receiver 1 3.5mm Audio Cable Adapter 1 Charging Cable Note: Please allow slightly errors due to manual measurement and different monitors.