1.Material: metal 2.Feature :with anti-impact design 3.According with standard ISO4190,EN81,GB /T24477; Description : ... 1. The push button adopts zinc alloy body with anti-impact design , the surface processing can be customized by different electroplated ... colors are available; 5. The series include: floor indicator, up/down, open door/ close door, alarm, telephone, emergency stop, emergency, ...