The rechargeable Dehumidifier is perfect for keeping out moisture in your safe or gun room. This compact dehumidifier features water glass crystals that absorbs moisture and it has a window that indicates when it's time to recharge. Plugging it into any wall outlet will quickly and easily recharge the cyrstals so it's ready to use again and again. Dimensions 8.5" x 6" x 2.5" (LENGTH X WIDTH X DEPTH)