1、Professional Design: Car bluetooth aux adapter is designed to turn your home or sound system or speakers into a hands free Bluetooth device that can be used to play music or talk on the phone. 2、Advanced Bluetooth Technology: Car bluetooth aux adapter is equipped with the latest Bluetooth v1 chipset and low latency technology to ensure instant pairing and stable connection within 10m/38ft, providing lag free hifi stereo sound effect. 3、Hands Free Calling, Plug and Play: 5mm aux bluetooth adapter with built in microphone to enjoy Bluetooth playback of music and hands free calling; plug and play, direct charging via USB and 5mm port while playing plug in car or home stereo 4、Easy to Use: The 5mm aux bluetooth adapter is easy to use, no built in battery, no need to turn it on and off every time, just plug it into the 5mm aux jack and power it through the USB port. 5、Support System, Auto Connect: Car bluetooth receiver supports sound codec SBC and profile A2DP AVRCP. it starts automatically when the engine starts and connects to the last used device automatically, no need to reconnect. Enjoy free wireless music streaming. 1 x Car Bluetooth Aux Adapter1 x Manual Item Type: Car Bluetooth Aux AdapterMaterial: TPE, AlloySize:Line Length (Unstretched) : Approx. 30cm/ 11.8inLine Length (Stretched) : Approx. 120cm/ 47.2inOutput Interface: 3.5mm Bluetooth Version: 5.1 Transmission Distance: 10m/ 32.8ft Without Obstacles Response: 20Hz-20kHz Frequency Range: 2400- 2483.5MHz Output Power Range: 33mW RL=16Ω