Maintenance-free solution for humidity control in gun safes, cabinets and small enclosures. Mount vertically or horizontally with snap-on mounting brackets. Innovative plug may be removed to help install the cord through small holes or openings. Helps prevent rust and corrosion. Easy to use, just plug it in. 7 watts coverage is approximately 100 cubic feet. Can be used horizontally or vertically. Optimal mounting location is horizontally near the floor of the safe or closet. For indoor use only. Do not touch rod after plugging it in. Plug may be removed to help install the cord through narrow holes or openings.