Description

Blu-ray (Otis utilise 3 fils)

Blu-ray (les autres marques utilisent 4 fils)

Lumière blanche (3 lignes pour Otis)

Lumière blanche (les autres marques utilisent 4 fils)

Lumière rouge (Otis utilise 3 fils)

Lumière rouge (les autres marques utilisent 4 fils)

Feu rouge A311

The button is divided into blue light, white light, and red light, but the color of the light is different. For Otis, please buy 3-wire (Otis has no red light), other elevator brands please buy 4-wire, 3-wire and 4-wire cannot be used in common. 3-wire and 4-wire refer to internal wiring, not visible from the outside. There are 4 pins.