The TEAM AWS Airsoft team built a great device in a steel suitcase, which they affectionately call “The Burrito”. They modified the software to have a higher countdown value and the timer starts when the case is opened. They also amplified the sound with a speaker. Great build, guys.
They added a component that has 4 disposable flash bulbs which flash when the bomb detonates. The flashing can even be activated remotely to distract the defuser! Now that’s innovation.
Check out this video to see it in action. This was made before the flash unit was added.