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 power head control, pet bowls, fish tanks, filtration, heating, or what ever your project may be 1pcs Tank Pool Horizontal Water Level Switch Liquid Level Sensor Liquid PP Plastic Ball Float Switch Features: . Contract rating (Max): 10W Switching voltage (Max): 110VDC/AC Switching current (Max): 0.5A Breakdown voltage (Max): 220VDC/AC Carry current (Max): 1A Contract resistance (Max): 100 OHM Temperature rating: -10 ~ +60 Celsius degree colour:Black Material:metal size:Cable length: 40cm, float length: 8.5cm Package Contents: 1 x Liquid Level Sensor Only 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.