All Braun shavers go in straight, intuitive strokes so you don't need to circle over the same spot twice, helping to minimize skin irritation. The specialized cutting elements are pressure sensitive and protected by a patented metal mesh (SensoFoil) Brauns pressure-sensitive blades automatically retract to protect your skin - allowing you to shave faster and with great skin comfort. Braun'S ProSkin Micro Comb technology catches more hair from the first stroke for an even and gentle NiMH battery fully charges in 1 hour for 45 minutes of cordless electric shaving. A quick 5-minute charge is sufficient for 1 shave, clean & charge station (On specific models only) 100% waterproof, Battery, Li-Ion 45 min shaving, NiMH 45 min shaving, NiMH 20 min shaving.