Counts down by seconds.
In the last minute it sounds a short beep every 10 seconds.
The last 10 seconds it will sound a beep every second.
One long beep will sound when time is up.
This kit is a good example of how a microcontroller works.
GT-10 PCB size: 2.3" x 4.8"
Optional Case size: 1.6"H x 2.5"W x 5"D
