A waterproof trimmer is a device whose construction is sealed against water ingress. This allows it to be safely used in wet environments, such as in the shower, or simply rinsed under running water after use. This significantly facilitates its cleaning from hair and beard residues. It is important to distinguish between a 'rinseable' device, which can only withstand rinsing, and a fully 'waterproof' model, which is also designed for complete immersion in water and wet trimming. The level of water protection is often indicated by an IP rating, for example, IPX7, meaning the device can withstand submersion in water up to one meter deep for 30 minutes.