Total length: 67mm/2.6in; Floating Ball Size (approx.): 24 x 23mm/0.94" x 0.91in (L*D); Thread Diameter (approx.): 10mm/0.39in; Cable Length: 40cm /15.7" Maximum Switching Voltage/Current: DC 110V/0.5A HOW TO OPERATE Using a magnet to detect the reed switch. The float switch is mainly composed of a magnetic spring switch and a float. There are magnetic materials in the float. When the float goes up and down with the water level, it will touch the magnetic spring switch to detect the position of the liquid WIDE APPLICATION The float switch can be used for water heating equipment such as dispenser water heater, water heater, humidifier, etc. It can also be used for water tower, drainage pool, water tank, culture pond, etc. PLEASE NOTE As the current the switch can carry is very small (0.5A), you need to use a relay or contactor when connected by a load, the relay or contactor is not included here .