... , non-toxic, waterproof, dustproof, anti-acid and anti-alkali, shockproof, the keyboards are arbitrarily crimped, portable, non-deforming in low and ... up without wrinkle, silent typing and convenient to carry on- Powered by USB/PS2/2 port- Working temp.: 60-250 0C - Size ... , built-in anti-interference - Button force: 50-90 g - Service life: 15 million times- Net weight: 270 g