It is Compact. It is Spill/mess free. It is Eco-friendly. It is Non-toxic, making it safe and worry free for children and pets to be around Unit stays charged for 20-30 days Protects small spaces up to 333 cubic feet from mold, moisture and mildew Perfect for any household room, safes, closets, gym lockers, musical instruments, offices, storage containers,etc. No batteries or cords for use 100% renewable energy