3PCS LAGUTE Adenium Renewable Wireless Mini Dehumidifier, Absorbs Moisture, Max 500 cubic ft. Area, No Batteries or Cords Required, Non-toxic and Environmentally Safe, High Capacity, Hook Included for Hanging L-A01 (Small) Non-toxic, safe and silent punch to get rid of excessive humidity. Can be placed in any area up to 300 cubic feet and silently absorb moisture. Use a renewable silica gel technology that works without batteries or power. Change one time for 12-15 hours, and it could work for about 2-4 weeks depending on different circumstance. An indicator window shows color changing of the inside crystals.