The remote control was an instant fail, so along came this new enclosure.  The battery just flops around inside.  It could use a foam stuffer to keep everything from moving, but it just sits on the bathroom counter.  The idea is to have a big mashable button to get the light on in a hurry during a bowel emergency.  A small button on an edge wouldn't do the job.  The best way to avoid a bowel emergency is to have the equipment ready to deal with it.

Of course, the fan has to already be on for the remote control to work.  There's going to be a delay from 1st seeing if the fan is on.

The light always comes on when the fan is 1st turned on.  Note that there is a delay when turning on the light from the fan switch.  The USB charger has a startup delay.  Then the PIC has a startup delay.  Fortunately, the firmware is smart enough to turn on the light before initializing the radio.