... .Embossed metal domes 2.storage temperature:-40oC-+80oC 3.with transparent windows 4.100% QC 5.Water proof Performance ... 40 degree~+85 degreeHumidity40 degree 90%~95% 240hoursMembrane switch,membrane keypad,membrane keyboard Advantages:Beautiful appearance, rich and bright in color, ... proof.Low cost, high lifespan, membrane switches design and manufacturer are using the keyboard as a whole way ,whether ...