The Lawn Mower® 4.0 features powerful upgrades and keeps some of the most popular features of its predecessor. 7,000 RPM motor with QuietStroke™ technology for low vibration and rechargeable 600mA li-ion battery. Wireless charging system. *SkinSafe™ Technology. Waterproof** for convenient use in the shower. 4000k LED spotlight with diffuser. Easily cleaned under running water. As part of a comprehensive male grooming product lineup, this groin and body trimmer provides the best and closest trim for your entire body, including chest hair, back hair, and pubic hair. *SkinSafe™ technology does not guarantee cut protection. **IPX7 rated to protect against immersion in up to one meter of fresh water for up to 30 minutes.