Aluminum alloy material, a variety of colors are optional, with frame, the buttons can be customized by sending codes, the text on the button is hollow, the brightness of the light is adjustable, and the light color can be chosen as bright white or warm yellow. The button will feedback by vibration, body induction, scene linkage, 485 bus interface, DC 24V power supply, 86 bottom installation (external size 86*86)