USB keyboard,silicon keyboard Size:443*135*6.5mm Bluetooth as option Working Temp.:60~260 Deg C Water resistant USB Flexible Keyboard,Foldable Silicon KeyboardAdopted 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 ...