Unfortunately, it's useless – you have to buy the app before you can even use the device at all. The programming is poor, you can only set it for 4 days (from the start date). It's a shame, definitely not recommended.
The app is barely usable, the device is constantly offline for no apparent reason. Adjusting schedules is very cumbersome and the food doesn't get warmed up either – it's still very, very cold at feeding time. Overall, I can't recommend it at all, save your money!