Use them with hydroponics， saltwater tank， freshwater tank， gardening， aquariums for power head control， pet bowls， fish tanks， filtration， heating， or what ever your project may beUp float switchContains no mercurySpecificationsCable Length 12"Maximum Load 50 WMax Switching Voltage 250V DCMinimum Voltage 100V DCMaximum Switching Current 0.5AMax Load Current 1.0AMax Contact Resistance 0.4ΩTemp Rating -20 ~ +80℃Net Weight 10gProduct Number FS-1B-31Package Includes1 x Liquid Water Level Sensor Horizontal Float Switch