Highly antidestructive power Traveling Distance of key 0.45mm elasticity of key 2.5-3N Contact resistance<100 Ω Service life≥ 200 thousand key ,material of face- plate : stainless steel character of the key's surfece : laser mark and a heavypainting Main components Stainless steel board imported Stainless steel button imported Metal Dome PCB metal button plate User choice Button chrome-plasted colors: polished or Other usage keyboard is available besides using for telephone Package Carton size:420*340*115mm G./N.W.: 11/10KG 20Ft Qty: 1640 ctn