The ERGN30 is usable in both wet and dry conditions and is washable for easy maintenance, improving hygiene and durability. Cleaning up afterwards is as simple as washing under water. Battery operated, it can last approximately one year with Panasonic AA LR6 alkaline batteries when used once a week, for 90 seconds at a time, including washing operation. The dual-edge 60 inner blades are curved hypo-allergenic and stainless steel blades that are designed to leave the proper amount of hairs for natural filtering. The safety cone guides the hair into the blades and protects the skin from direct contact with the rotary blade system.