Audio Receiver Bluetooth 4.1 Receiver for Car Connects to the AUX port (LineIN) of car audio systems and stereos without Bluetooth functionality, and connects to Android smartphones, tablets, iPhones, iPods, etc., for music playback and hands-free calls. Operation is easy with just one button. You can answer, hang up, and redial phone calls. Built-in battery allows use on the go. Charging is done by connecting to a computer's USB port or a USB-AC adapter, etc. Enjoy the music on your smartphone in your car, at home, or on the go. ★ Battery life: 3 hours to 8 hours ★ When connecting headphones directly, adjust the volume from your iPhone, Xperia, etc. ★ Enjoy high-quality calls and music on your iPhone, smartphone (mobile phone), tablet, computer, etc. Connection type: Wireless Features: Bluetooth Connects to the AUX port (LineIN) of car audio systems and stereos without Bluetooth functionality, and connects to Android smartphones, tablets, iPhones, iPods, etc., for music playback and hands-free calls. Operation is easy with just one button. You can answer, hang up, and redial phone calls. Built-in battery allows use on the go. Charging is done by connecting to a computer's USB port or a USB-AC adapter, etc. Enjoy the music on your smartphone in your car, at home, or on the go. ★ Battery life: 3 hours to 8 hours ★ When connecting headphones directly, adjust the volume from your iPhone, Xperia, etc. ★ Enjoy high-quality calls and music on your iPhone, smartphone (mobile phone), tablet, computer, etc. Connection type: Wireless Features: Bluetooth