The Plantronics Discovery 645 Bluetooth Cell Phone Headset lets you stay connected like never before. This device features a sleek in-ear design and an innovative pocket charger that gives you up to 3 hours of talk time and 120 hours stand by time. The unit's charger is powered by a single AAA battery. The Discovery 645 weighs in at only ten grams and it is stylish, comfortable, and convenient. Plantronics combines cutting-edge technology to set a new standard in Bluetooth wireless headsets.Comes with 4 Adapters for most common phones.