The patented design uses tried-and-true PEET air circulation to remove humidity that causes mildew and rust damage to guns in storage. The SafeKeeping Dryer is hassle-free since nothing needs cleaning or replacing and it's easy to install. If that wasn't enough, this 15-watt dryer operates safely and silently. 5 year warranty This product is designed to be used on 110-120V. If used on 220V or used with a converter to reduce voltage to 110-120V, Peet is not responsible for performance of dryer or the damage of any garments when used this way.