The receiver connects to the AUX port in your car to enable your car sound system to stream audio from smartphones wirelessly. It connects to your smartphone automatically once it is turned on. With a full charge, it provides up to 8 hours of playing time. In addition, the sleep mode saves power while it is not within the range. Besides, this Bluetooth receiver is also designed to work with home stereos, speakers, headphones, etc. by 3.5mm stereo inlet socket. Features: Supports hands-free can connect microphone and support phone calling through Bluetooth receiver Sleep mode for saving power Compatible with home stereos/speakers, car stereos, headphones Support iPhone, Android phones, other smartphones which support Bluetooth A2DP profile Perfect for cars Turns anything with an AUX port into a Bluetooth device Hands-free calling What's in the box 1 x iTech Andowl Handsfree Transmitter 1 x Micro USB cable