They are plastic strips that wrap around your steering wheel. You get 10 in a pack and they have the following info on them:
1. TV/satellite antenna
2. dinghy/trailer
3. slide locks
4. hookups
5. jacks/chocks
6. steps/ladder
7. door/vents/windows
8. compartment locks
and two blanks
When you plug in your electrical, you slap the hookups strip onto your steering wheel, etc. Then when you get ready to leave, you are reminded that you need to unplug the electrical.
I made one of the blanks "Propane On" so I would remember to shut down the propane. The other blank is "Emergency Brake" because my dash light doesn't work.
I think they were the best $20 I spent.
http://www.campingworld.com/shopping/item/rvminders-set-of-10/66688