The remote unit of my car's alarm system. Yup, that little lamp should be attached to the board. A bit of loctite glue and a set of pliers to the contacts took care of it. Makeshift all the things!

These infrared remotes have always been a bitch to use because they have a range of about 2 meters and must be aimed at a very specific angle (as described in the manual) for the signal to be detected, but mine's working like a million bucks now. And I only locked myself in the car 7 times. Eat that, high end anti theft systems!