The watertight Nema 4X enclosure works ideal for indoor high humidity environments. The two knob control system, allows you to simply dial the desired amount of on /vs off time to set the desired cycles. The mode button lets you choose between four different time ranges from 5 to 60 minutes. Designed to endure high humidity conditions, this control requires no wiring and comes supplied with a convenient pre-wired piggyback electrical plug.