The title says it all. This switch is easy to fit into tight spaces -- I keep it next to the piano pedals and use it to electronically turn pages on my iPad. Switchable "polarity" (a misnomer: it's really "contact form") is handy, but I must take off one point because the positions are unlabeled and the unit came with no documentation. That could cause embarrassment in a hurried performance situation. (I stuck on my own NC and NO labels.)