XIZI Elevator Push Button BR32

XIZI Elevator Push Button BR32 BR32A(B), Braille and non-braille, round button,  Red light Blue light White light, Opening diameter 27mm.

Please buy 3 lines for , and 4 lines for other elevator brands. 3 lines and 4 lines cannot be used in common. 3-wire and 4-wire refer to internal wiring, not visible from the outside. There are 4 pins.