Intermatic wall mounted 30 minute spa blower or jet pump timer. Auto-Off Timer allows setting a time cycle of 4 minutes to a maximum of 30 minutes of run time for any appliance - pumps, blower, lights, fans, music. Timer switch is 120v, 20 amp, SPST. Brushed metal wall plate with minute increments and dial, fits into standard single gang wall box. Does not require power to operate, completely mechanical, but is wired into the device circuit as Normally Open. Switch closes when timer dial is turned, and opens again when time runs out. Primarily used as a blower timer switch, but works for any 120V device.