Usage Tips:It has 3 buttons, a red stop button, and 2 yellow up and down buttons. You can control to the range you need at will The outer layer is equipped with a metal lock and key, so there is no need to worry about being operated by others Adopt high-quality ABS fireproof metal shell, sturdy and durable, efficient and dustproof Pure copper contact button, carefully crafted from selected materials Style:A / B / C / D Colour:As shown Material:ABS+metal Package Contents: 1 set * surface-mounted button kit with lock / 1 set * concealed button kit with lock / 1 set * surface-mounted button kit (with large bottom box) / 1 set * concealed button kit (with small bottom box) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.