This application was for me a must-have before the Timely arrival and it is free with the purchase by Google. If you have problems waking, rest assured that this app does not stop ringing as voud will not emerged, that is if you have set the unlock mode "math problems". For the rest, it is a very common alarm. I would have rated 5 stars there 2 years, 4 today facing Timely design which is now 100% free. As to opera rather I suggest leaving a buzzer to get up and play a CD in a good stereo, false hopes truce. Good app which nevertheless deserve to be paid.