Amazing! I love this product. Just as I expected to wake me up also pretty good battery life as well. Just a heads up certain phones control certain things for example the vibration of your Smartshaker. I had a phone that only let me choose one vibration settings I ended up getting a new phone and I got the option to choose 3 different vibrations. 1: being for the light sleeper, 2 : for the average sleeper, 3 : for the heavy sleeper!