1Simply plug the 3.5mm auxiliary adapter into the AUX input of the old audio device and pair it with your Bluetooth device. You can easily enjoy your favorite music . in Bluetooth Car Kits2: Using the latest Bluetooth 4.1 EDR technology, audio signal transmission will not be distorted, the connection is more stable, Support HFP / HSP / A2DP / AVRCP. The maximum connection range of 33 feet makes your life smarter. 3Easy to Use: There are 3 function buttons on our Bluetooth receiver. It allows you to easily turn on/off, play/pause, adjust the volume/track, answer/reject/redial the last called number. . After the first connection is successful, the Bluetooth receiver can be paired automatically. 4Up to 10 Hours of Battery LifeThe working time of this aux Bluetooth adapter is up to 10hours when making calls or playing music. . In addition, this Bluetooth music adapter can be used while charging, which is very convenient. 5Extensive Compatibility: The portable Bluetooth receiver can connect two Bluetooth devices at the same time. And it can also be compatible with any iphone or Android smart phone and other Bluetooth electronic devices, very suitable for all kinds of old home or car audio systems and wired headsets. It also supports TF card music playback. Let you use without any restrictions.