Beep every half an hour.
This app is similar to a striking clock.
Beep every half an hour.And special beep at 3, 6, 9, 12 oclock.
If quit, switch off.
Silent mode : Switch off first, and you can fix times, and
then on again.
Refer to,
http://tskit.co.kr/zbxe/download/3002
[email protected]"