Description: Audio Receiver Transmitter :AUX Car Audio Adapter can connect to the 3.5mm AUX port in your car to enable your car sound system to stream audio from smartphones wirelessly, make wired devices become handfree devices. Stable Transmission:5.0 chip,low latency, low noise, fast operation, , upgrade dual audio,compatible for home theaters, stereo systems, and car stereos etc. HIFI sound quality: Plug and play,you can enjoy HIFI sound music easily.The built in microphone can also be used for handsfree calling, voice navigation, connecting to TV or projection, etc. Lavalier wear: Back with clip design, tight and firm, easy to clip on clothes, sports/traveling is not easy to fall,and easy to carry Large Capacity Battery: Built in 140mAh rechargeable lithium battery,charge once,continuous use 4-10 hours.When the battery is low,it can be used while charging. Easy to set up, one key operation, clear status indicator,which is convenient and worry free. Specification: Product :Audio receiver transmitter version:5.0 Connection range:15m Product interface:3.5mm audio interface Frequency response range:10Hz-20HKz Signal to noise ratio:less than 110dB Product function:receiving/transmitting 2 in1 Material: ABS plastic Size:6cmx2cm/2.36inchx0.79inch Package Includes: 1 Piece 3.5mm Jack Aux Dongle Adapter 1 Piece Connecting Line 1 Piece User Manual Note: 1.Please allow 1~3 cm error due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you