The ordinary type is controlled by a reed switch, and the upgraded type is controlled by a chip. The upgraded model has the advantages of having an indicator light, not afraid of falling, and high and low temperature resistance. The voltage range of the ordinary type is 0-250V, the voltage range of the upgraded version is 0-30V, and the voltage used for normal elevator leveling is about 24V, both of which can be used. If it is for other functions, please confirm the voltage before purchasing.