Watch beep description

This application was developed just to beep every hour like my old Casio did. I just used to hear this sound every hour. I decided to post this application if someone else wants to be notified every hour.
Also usefull features:
- short beep every half hour (can be disabled)
- do not beep from ... till ... hour (for example at the night, default settings are from 10pm till 9am)

Since this application was developed for myself I did the most battery efficient code. No background services consuming battery!!! It uses system alarm service that runs always.