Cordless convenience with an Energy Star rating! The AccuCharge system charges twice as fast so you can be ready for any quick pick up with 15.6 volts of cordless cleaning power. Move easily from carpet to hard floors with a fingertip on/off brushroll switch. When the unit is charging, the AccuCharge circuitry constantly monitors the battery. Once the battery is charged, power is reduced to a trickle to maintain the battery without drawing extra power. This remarkable system reduces energy consumption by 70% and extends the life of the battery.