Stainless Steel Blades for long-lasting sharpness Choose 5mm long beard, short 3-day stubble or zero trim look Skin-friendly blades for smooth skin DuraPower technology for a longer-lasting battery life Up to 30 minutes of cordless use after 8 hours charging. The DuraPower technology ensures a long-lasting battery performance, while the self-sharpening stainless steel blades trim consistently as on day 1. This trimmer can also be charged with a micro-USB cable and runs for up to 30 minutes.