A float switch is a device used to sense the level of liquid within a tank, it may actuate a pump, an indicator, an alarm, or other device.Use them with hydroponics, saltwater tank, freshwater tank, gardening, aquariums for head control, pet bowls, fish tanks, filtration, heating, or what ever your project may be1pcs Tank Pool Horizontal Water Level Switch Liquid Level Sensor Liquid PP Plastic Ball Float SwitchFeatures:.Contract rating (Max): 10WSwitching voltage (Max): 110VDC/ACSwitching current (Max): 0.5ABreakdown voltage (Max): 220VDC/ACCarry current (Max): 1AContract (Max): 100 OHMTemperature rating: -10 ~ +60 Celsius degreecolour:BlackMaterial:metalsize:Cable length: 40cm, float length: 8.5cmPackage Contents:1 x Liquid Level SensorOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.