It's great that there's an app, it's super easy to set everything up from there (where it can go and where the battery is low) well, the battery charge isn't bad, and this gift has far surpassed any others in terms of usefulness. I received this charm for my birthday, and while I admit that I was initially skeptical about robotic vacuum cleaners, my skepticism has since been proven to be unfounded. Overall, I was happy with the gift (which I have affectionately named Kuzya).