This is the coolest little alarm clock/ sleep trainer. My 3 year old didn’t need it to sleep train, rather she needed it at nap time. She likes to go take a nap, which is 20 minutes. Obviously not long enough, she actually napped and didn’t get out of her bed after I set this up in her room. She understood that she couldn’t get up till the light turned green. I’m thrilled that she actually stayed in her bed til the puppy’s light turned green. She slept all this week at nap time. No more running out of her room in 20 minutes. It was super easy to set up and loved that it also came with a wall plug in. Great product and a happy customer! [This review was collected as part of a promotion.]