Microchip feeder, it scans their microchip and opens for that cat only. Anubis isn't chipped yet so he is currently wearing an RIF tag that I registered to the feeder.
 
The company that makes them is SurePetCare.com they do feeder, pet doors and water bowls. I think they also do a tag that tracks your pets location and stuff too (not 100% on this one).

The vest helps to combat obesity, reduce anxiety, increase performance, strengthen cardiovascular health and build muscle. It also makes dogs use more energy while doing everyday things. It's great for high-energy dogs. I've seen a difference already with Ollie. By the end of the day, he's exhausted.