Rock Light Beard Trimmer Cordless and Corded for Men (Blue and Black) 9077 Long lasting performance due to DuraPower technology Up to 90 minutes of cordless power after 1 hour of charging Skin-friendly rounded tips for smooth trimming 27 lock-in length settings, 0.5 - 10mm with 0.5mm precision Self-sharpening steel golden blades When you want to look your very best, Rock Light has the right grooming solution for you. Rock Light combines technology with design & the trimmers last up to 4 x longer vs. ordinary trimmers . The Rock Light beard trimmer delivers an effortless, even result time after time. Self-sharpening blades are long lasting and stay as sharp as on day one , while rounded tips and combs are gentle on your skin preventing irritation.