One of the rarer ones, this one pops up on Ebay occasionally for obscene prices. I have yet to see any of it in action myself, but based on the instructions, it seems to run similarly to other Nano Pets. Notable however is that it does include exercise and a weather function, and that you are instructed not to feed it too much, and to vary its meals. If you have any pictures of the screens that you would be interested in sharing, please reach out to me!
The instructions I have here are thanks to Daughter of Anubis on Tumblr