Xizi Otis Elevator button BR27C A311 BR27A stainless steel round button

This button is divided into blue light, white light, and red light, only the color of the light is different.

Please buy 3-wire for Otis (Otis does not have red light), and please buy 4-wire for other elevator brands. 3-wire and 4-wire cannot be used interchangeably. Lines 3 and 4 refer to internal lines and cannot be seen from the outside. The pins are all 4.