USB keyboard silicone rubber keyboard Bluetooth as option Working Temp.:-30~80 Deg C Water resistance and washable Silicone Rubber Computer KeyboardsAdopted completely sealed design, environmental protection, non-toxic, waterproof, dustproof, anti-acid and anti-alkali, shockproof, the keyboards are arbitrarily crimped, portable, non-deforming in low and high temperature, sound-off and ...