AUTOMATIC ON/OFF SWITCH LEO pool cover pump has a automatic switch. It will automatically turn on when water has been detected at 2 ''. When the pump remove water to approximately 2/5 in., the pump will run for additional 60-seconds and then turn off. REMOVE WATER EFFICIENTLY 1/4 HP pool cover pump moves up to 2910 gallons per hour, which drains up to 2-times faster than a standard pump. Bottom suction design can remove water down to 3/4 in. Great for removing water from pools, pool covers, tarps, window wells, hot tubs, boat covers, rooftops, spas and more. SUPERIOR DESIGN The submersible pump with strainer base is easy to clean without tools or screws. Strainer base protects the pool cover, filters debris and keeps the pump stable. Built-in temperature control core prevents the motor from dry burning when in short of water and protects the water pump from damage. GOOD COMPATIBILITY Equipped with 25 ft. 3-prong plug power cord, which could plug into any standard 115-Volt wall outlet 1-1/4 in. NPT discharge and 3/4 in. garden hose adapter with check valve provide more convenience to operate and use. WHAT YOU GET Package includes pool cover pump, a 3/4 in. check valve adapter and a manual. This pool cover pump comes with 2-year warranty. Please do not hesitate to all us.