A float switch is a device used to sense the level of liquid within a tank. The switch may actuate a pump, an indicator, an alarm, or other device. Use them with hydroponics, saltwater tank, freshwater tank, gardening, aquariums for power head control, pet bowls, fish tanks, filtration, heating, pumps, ponds, basement alarms, boats, air condition drain pans, pressure washers, carpet cleaning mach, reef aquarium, fluid control, ice machines, coffee pots, marine, automotive, automobiles, tropical fish tanks, evaporator coils, condensation line, in relays, or what ever your project may be. Note: because the current that the switch can carry is much little(0.5A), you must use a relay or contactor when it is connected by a load, relay and contactor are not included here. Thread Dia: 9.5mm Wire Length: 39cm or 15.35 inch Float Ball Size: 55 x 17mm or 2.2 inch x 0.67 inch (LxD) Max. Breakdown Voltage: AC or DC 220V Max. Switch Current: 0.5A Max. Switch Voltage: AC or DC 100V Max Wattage: 10W Temperature Range: -30C- and125C Max. Contact Resistance: 100m Ohm Hex Head Size: 14 x 14 x 4mm or 0.55 inch x 0.55 inch x 0.16 inch (LxWxT) Breaking Height: 94mm or 3.7 inch Breaking Angle: 45 Degree Body Total Length: 119mm or 4.6 inch Product Name: Float Switch Country of Manufacture: CHINA Material: Stainless Steel Color: silver Net Weight: 38g Package Content: 1 x Water Level Sensor Note:Light and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is 1-3 cm.