Descriere
The button is divided into blue light, white light, and red light, but the color of the light is different. Please buy 3 lines for Otis, 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.
Recenzii
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