Features: Material: Plastic Color: Black Switching Power (Max): 10W Switching Voltage (Max): AC 100V Switching current (Max): AC 0.5A Electrical resistance: AC1500V/Imin Resistance to contract: no more than 200 milli-ohm Temperature rating: -20 to +80 degrees Celsius Cable length: Approx. 400mm / 15.76" Cable length: float: 85 mm / 3.35" It can be used to detect the level of liquid in a tank; can activate a pump, indicator, alarm or other device. Note: It can be used with hydroponics, salt water tank, water tank freshwater, gardening, aquariums for feed head control, pet bowls, aquariums, filtration, heating; but you must make sure your project is mercury free before using. Package Included: 5pcs x Water Level Sensor Float Switch