RTP DOLARSLOT This capability is needed in some particular applications, such as dairy milking machines, and is provided by some manufacturers' products. Vandal-resistant switches are often low-voltage, low current, so-called "signal" types intended to trigger a change in state, perhaps from "off" to "on" and vice versa. The mechanical types often have gold-plated contacts that do not corrode, to allow reliable low-power switching.|Nippon Ichi Software