Plantronics Voyager Pro HD Wireless Bluetooth Headset - Compatible with iPhone, Android, and Other Leading Smart Devices - Black HD AUDIO BLUETOOTH HEADSET: Signature Plantronics audio technology features crisp high definition audio. SMART SENSOR TECHNOLOGY: Our technology senses when the headset is being worn so it can automatically answer calls as you place the headset on your ear or redirect audio to your phone when you set down your headset. LONG LASTING BATTERY: Bluetooth hands free headset battery lasts for 6 hours of talk time and up to 5 days of standby time. NOISE CANCELLING TECHNOLOGY: WindSmart technology uses an electronic filter within the mic circuitry, making call audio sound more natural and clearer on the iPhone, iPad, Android, and other smart devices.