make sure your computer clock is set to the atomic clock in Colorado.
Use this program or another one
http://www.philex.net/clock/
(this one is freeware)
Sync your clock with the atomic clock and listen every 15 minutes when the floor rings the buzzer. Look at your clock and make sure it is exactly at the ??:15:00 mark when they ring buzzer.
THis will tell you which is a better one for your area.
rtharp
Use this program or another one
http://www.philex.net/clock/
(this one is freeware)
Sync your clock with the atomic clock and listen every 15 minutes when the floor rings the buzzer. Look at your clock and make sure it is exactly at the ??:15:00 mark when they ring buzzer.
THis will tell you which is a better one for your area.
rtharp