This is the season (the expanded Christmas Shopping/Decorating Season) when the borgs stock the remote controls used to control holiday lighting. These are the very same remote controls that we can use to control shop-made air-filtration systems. The same remote controls we can use to control contactor/relay systems for our cyclone dust-collectors or air-compressors (even when they are located outside the shop (for noise control)).
I bought three units today for less than ten dollars each.
I bought all three to match the channel frequency of the remote controll I use for my cyclone dust-collector (the remotes can be a,b,c,d, etc....) in order to place the control fobs nearer the machines/work stations that require dust collection. (I bought all c channel so they would all control the one unit that controls the relay that powers the cyclone.)
Until today, I had only one fob unit for my dust-collector, and found myself retracing my steps in the shop to find where I had last used it or set it down. Or I would find myself making 'just one or two cuts' without using the dust-collector.
Now I am never more than two steps away from a permanently located fob; usually closer.