The automatic bilge pump has small size, high efficiency, low current to achieve a small size perfect combination of high current. Unique automatic "discharge" function can withstand long-term continuous operation under almost overload condition. It has cost-effective switching power supply support. The automatic bilge pump does not need to be fully submersible for it to work there is a auto switch at the bottom in the blue tray but you have to wire it in to a live feed of you can wire the pump to come on when needed when you switch on the pump works on a 12v power supply your pump is in your engine bay to pump out wate. The automatic bilge pump with water cooled motors for long life, with anti-airlock design and moisture-proof seals. Snap-lock sieve base for easy installation. The strainer is easy to remove to clean the impeller. It is very nice for your family to clean the ponds or pools and save a lot of time. The automatic bilge pump comes with a positive and negative wire that you can attach to a battery or large enough solar panel with the fittings. The pump is quite powerful so if it is pumping a lot the amount of energy needed to keep going would be more that is usually stored by the basic solar systems. You can wired the automatic bilge pump to the 12 volt battery in the dinghy and it does its own thing quite happily. When it is going to be dry for several days you can disconnect it as it automatically comes on about every two and a half minutes to check the water depth. If there is water it will pump it out and then just stop until needed again. Be widely used for draw water in yachts, fishing-boat, the industry as well as a camper, etc. No separate float switch is needed. Fully automatic bilge pump. Build-in float switch system. No power use until the pump turns on when the water rises. Build with the compact, efficient, long-life motor. Small size for space-saving. The strainer of the bottom for quick release. Specification: Voltage: 12V DC Flow capacity: 750 Gallons per hour (2850 Litres per hour) - 47.5Litres per minute Max. delivery head: 3.8 meters (height of vertical water flow up pipe) Current: 3.8 Amp Material: PVC+Copper Flow Rate: 1100 GPH Size: 14*9.7*8cm Color: White+Blue Package Included: 1 * Automatic bilge pump