The simplest solution for guest room odors. When the housekeeper finishes cleaning the room, she can simply set the timer and leave to service the next room, piggybacking the unit behind from room to room until all are done. This unit can deodorize a 300 cu. ft. room in just 15 - 20 minutes. Has a 0 - 60 minute timer, 102 CFM fan, and an ozone output fixed at 300 mg/hr. For US use only.