Electronically detonated explosives require a perimeter free of electronic transmitting devices. This interactive exercise quizzes learners to reinforce their knowledge of what devices are banned from electronic detonation areas. Wish you could try it out, but it was built in Flash, which can no longer be shown in a web browser. So I made a video of the exercise in action to show how the learner could learn from mistakes as well as from correct choices. (Also note the age of the devices--that beeper and sweet Motorola Razor are no longer cutting edge, and the watch just might be a transmitting supercomputing device that is now excluded from explosive detonation zones.)