A float switch is a device used to detect the liquid level in a tank; it can operate a pump, indicator, alarm or other device. Use them with hydroponics, saltwater tank, freshwater tank, gardening, powerhead aquariums. Control, pet bowls, aquariums, filtration, heating or any project you want 1 Horizontal Water Level Switch for Tank Pool Liquid Level Sensor Liquid PP Plastic Ball Float Switch Specifications: 110VDC/AC Switching Current (Max): 0.5A Breakdown Voltage (Max): 220VDC/ACC Carrying Current (Max): 1A Contract Resistance (Max): 100 OHMTemperature Rating: -10 ~ +60 degrees Celsius Color: Black Material: Metal Size:Cable length: 40 cm, float length: 8.5 cm. Package Contents: 1 x Liquid Level Sensor. Only the above package content, other products are not included.The measurement allowed error is +/- 1-3 cm.