DuraPower technology for a longer lasting battery life The DuraPower technology lowers the friction on the blades, which protects the motor and the battery from being overloaded. This way, the battery life time of your trimmer is increased by 4 times. Stainless Steel Blades for long-lasting sharpness Get a perfect yet protective trim, time after time. The trimmer's steel blades lightly brush against one another, sharpening themselves as they trim so they stay extra sharp and effective as on day 1. Up to 30 minutes of cordless use after 8 hours charging Charge your trimmer for 8 hours with your USB cable to get 30 minutes of cordless use.