3/9/20 - The E-333 provides dampness protection that is ideal for small spaces such as your gun safe. It prevents rust to guns and expensive ammunition and other damage caused by excess moisture. This eco-friendly dehumidifier silently and reliably protects clothes and valuables from mold, mildew and moisture. The unit lasts 20-30 days before renewing. Once the indicator beads have gone from orange to green, simply plug the unit into a wall socket to recharge! Special features of the E-333 includes: the unit works in areas up to 333 cubic feet, requires no batteries or cords for use, is 100% renewable, works up to ten years, is compact/silent, always spill and mess-free and is non-toxic, child and pet safe! The unit measures 6 1/4″ L, 1 ¼” W, 4 ¾” H.