Remax USA Hands free calling feature enables you to focus on driving and to answer your phones calls in a safe and convenient manner The latest Bluetooth technology gives you clear conversations and high fidelity music enjoyment by enhancing the sound quality of the wireless headset Charging on the go Support In car dock charging and USB charging. Your headset will never run out of power The headset automatically wakes, connects, and answers, letting you put your hand back on the wheel and safely enjoy your conversation; Up to 4 hours talk time, 3 hour of music listening and about (45 days of standby time)