First of all, the design is super adorable. The puppy with ball is fun and my kiddos absolutely love it! As a mother of 2 young children, I get woke up early often and as much as I love seeing my kiddos sweet faces it takes a toll on me so I was really excited for this sleep training alarm clock! Its really easy to use and after explaining it to my kiddos a few times they understood the concept. 
The ball lights up green when it is time to wake up and when the ball lights up red it means "sleep time." This works great for nap time as well. 
I like the fact that there is a compartment meant for parents only. Its where you can control the times without the kids messing with it.
I think this is a fun clock for the kids to use.. My kiddos seemed really interested in it and were excited to see the ball change colors. Its been helpful! [This review was collected as part of a promotion.]