Adopt high-quality ABS fireproof metal shell, sturdy and , efficient and dustproof It has 3 buttons, a red stop button, and 2 yellow up and down buttons. You can control to the range you need at The outer layer is equipped with a metal lock and key, so there is no need to worry about being operated by others Pure copper contact button, from materials, Weight: 0.16093745126 Pounds, Manufacturer: HuddleGlow