... high reliability, waterproof and dustproof features superior to a purely mechanical keyboard switch; key operation force of 60 ± 20cN; button ... in DOS, the Win9X, WinME, Win2000, WinXP operating system..Programming features All keys can be programmed, each key is ... without the resident program, to avoid software conflicts; provide multi-layer key, can be a different string definitions in the same ...