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 with hydroponics, saltwater tank, freshwater tank, , aquariums for power head control, pet bowls, fish tanks, filtration, heating, pumps, ponds, alarms, boats, air condition drain pans, pressure , carpet cleaning mach, reef aquarium, fluid control, ice machines, coffee pots, , 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/15.35 inch ; Float Ball Size: 55 x 17mm/2.2 inch x 0.67 inch (L*D) Max. Breakdown Voltage: AC/DC 220V; Max. Switch Current: 0.5A; Max. Switch Voltage: AC/DC 100V; Max Wattage: 10W Temperature Range: -30C- +125C; Max. Contact Resistance: 100m Ohm; Hex Head Size: 14 x 14 x 4mm/0.55 inch x 0.55 inch x 0.16 inch (L*W*T) Breaking Height: 94mm/3.7 inch ; Breaking Angle: 45 Degree; Body Length: 119mm/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 a little different from the real .The measurement allowed is +/-1-3 cm.