Check the listing for details. DEWENWILS Pool Pump Timer Box Outdoor, 24-Hour Programmable ON/Off Timer Switch. Color: Gray, Condition: New. Listed at 40.37 USD. DEWENWILS Pool Pump Timer, Mechanical Timer Box Outdoor, Heavy Duty 2HP 40A 120-277 VAC, 24-Hour Programmable ON/Off Timer Switch for Water Heater, Pool Pump, ETL Listed GrayDEWENWILS is a professional manufacturer specializing in Home Improvement, Consumer Electronics and Outdoor Equipment. Our primary aim was to provide you and other valuable members with higher quality products. A satisfying shopping experience is amongst our top priorities.DEWENWILS Outdoor Mechanical Heavy Duty Timer BoxTurn your heavy-duty home devices like water heaters, pool pumps, fountains, spa, mower, air conditioner, other equipment motors, etc. with the heavy-duty mechanical timer switch to make them ON/OFF as you hope.Operation Instruction1. Set the current time: Turning the dial clockwise until the arrow indicates the current time.2. Begin with all pins in the inner ring. Push the pins out for the duration you want the timer ON. Pins in the outer ring represent ON and the inner ring represents OFF.Note: Pins indicated by the arrow can not be push out, rotate the dial to make it work.3. Push the manual override switch to the “CLOCK ” position on the downside of the mechanical dial. You may override the operation of the timer by setting the switch to the “I” position, the power supply will always be ON. You may override the operation of the timer by setting the switch to the “O” position, the power supply will always be OFF.Be sure to set switch back to the “CLOCK ” for proper timer function.4. Make sure the electrical device is ON state so the timer box can control it to work properly.5. If blackout, reset the present time as indicated above.Note: Timer Box is capable of being configured for 120 VAC, 240VAC or 277VAC.