1、Bluetooth 5.1 Version: Bluetooth auxiliary adapter adopts an enhanced signal receiving circuit, which can connect quickly and provide stable and continuous audio. 2、Noise Reduction: With built in chip has AEC echo cancellation and ANC noise cancellation circuits to make the sound quality more pure and true. 3、Memory Function: Bluetooth adapter has an automatic connection memory function. After a successful connection, turn on Bluetooth again and it will automatically connect to your phone. 4、Small and Portable: This bluetooth wireless music receiver is lightweight. Small size but powerful, portable wireless music receiver bring you a better music experience! 5、Long Distance Transmission: This adapter can receive music up to 15 meters(about 49ft) away, allowing you to remote control music more conveniently.