The one I have for Lady has the dials on top. Lady figured out how to dig at the feeder until the top pops up. She can get it to pop up in about a minute. That's what I get for giving her Buster Cubes and Twist and Treats. She figured it was another treat dispensing toy.
This is the one I have:
Petsafe Electronic Pet Feeder,Automatic Dog Feeder,PF2-19
This one might work:
5 Meal Automatic Pet Feeder - New Kitten Center - Cat - PetSmart