Usage Tips:Total Length: 67mm/2.6"; Float Ball Size (Approx.): 24 x 23mm/0.94" x 0.91"(L*D); Thread Diameter (approx.): 10mm/0.39"; Cable length: 40cm/15.7"Maximum switching voltage / current: 110V DC / 0.5AHOW TO WORK - 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 rises and falls with the water level, it will touch the magnetic spring switch to detect the position of the liquidWIDE APPLICATION - The float switch can be used for water heating equipment such as water dispenser, 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.