This foot switch by Doctor Clockwork has an all metal housing and will stand up to the heaviest of usage.

If you have a traditional violet wand (i.e., not a solid state wand that has its own on-off switch), the foot pedal allows you to easily cut off the electrical flow to your wand. Often people use the rheostat dial at the back of the violet wand to turn off their wands. Even though the wand may seem like it is off, there is still electricity flowing to it that could potentially generate a shock. A foot pedal switch allows you to ensure that your wand is off and safe to handle-- whenever you need to change an electrode or attachment during play, or simply when you need a break.

Measures 2.625" w x 4" long x 1.25" h, with a 5-foot grounded cord.