The BlueAnt PUMP BOOST introduces the new audio adrenaline profile, packing a mega loud signature sound. These wired earbuds feature patented dual drivers with cross firing coils. Each ear features 15mm and 7mm diaphragms that deliver superb Energize HD audio all the time. The local and load design cradles the ear while holding firm no matter what you do. The built-in wideband microphone and controls for call, track and volume keeps you in control, even when your phone is in your pocket. The PUMP BOOST never needs charging, it is always there when you need it, because the music never stops.