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 tanks, freshwater tanks, aquariums for power head control, pet bowls, fish tanks, filtration, heating, pumps, ponds, alarms, boats, air conditioner drain pans, pressure systems, carpet cleaning machines, reef aquariums, fluid control, ice machines, coffee pots, automotive applications, tropical fish tanks, evaporator coils, condensation lines, in relays, or other projects. Note: because the current that the switch can carry is low (0.5A), a relay or contactor must be used when it is connected to a load; relay and contactor are not included. Thread Diameter: 9.5mm. Wire Length: 39cm / 15.35 inches. Float Ball Size: 55 x 17mm / 2.2 inches x 0.67 inches (L*D). Maximum Breakdown Voltage: AC/DC 220V. Maximum Switch Current: 0.5A. Maximum Switch Voltage: AC/DC 100V. Maximum Wattage: 10W. Temperature Range: -30°C to +125°C. Maximum Contact Resistance: 100m Ohm. Hex Head Size: 14 x 14 x 4mm / 0.55 inches x 0.55 inches x 0.16 inches (L*W*T). Breaking Height: 94mm / 3.7 inches. Breaking Angle: 45 degrees. Body Length: 119mm / 4.6 inches. Product Name: Float Switch. Country of Manufacture: China. Material: Stainless Steel. Color: Silver. Net Weight: 38g. Package Content: 1 x Water Level Sensor. Note: Lighting and different displays may cause the color of the item to appear slightly different from the real one. Measurement allowance is +/-1-3 cm.