The one that looks like a light bulb turns on the outside front scare light.
The flashlight looking one turns on the light on the end of the fob.
The end button turns on the system so the items can be operated - front jacks, rear jacks, slides, and awning.
Here is the link for manual for the system on our unit
http://www.lci1.com/images/Flyers/LIPSheets/Electronics/0146-digital-wireless-system-lcd-remote-2nd-gen.pdf
I had to replace the battery once so far.
Edited by: NorskeNY