this article about something called the Q Sensor, which is a wristwatch-like device that is specifically designed to detect signs of impending meltdowns in people with autism. It appears to be more of a data collection device, meant to track stress levels over the course of a day and possibly give insight into behavior antecedents and stressors.
Big Daddy had a great post about this topic just yesterday...the Q Sensor sounds like the hurricane sirens warning of the Category 5 meltdown that he alluded to. But I think that most of us could use help dealing with the fallout rather than having alarms going off letting us know that it's coming. For instance, BD speculated that the phrase "I have no tissues" headed off a major tantrum. If it's the case that your child is distracted from a meltdown by a random, confounding sentence or phrase, then the Q Sensor should be enhanced to generate some. Things like "In-a-gadda-da-vida" or "President Palin".
Or you could pre-record some winners yourself. In Audrey's case, it could say "Look over there! It's a dancing fountain and light show synchronized to classical music!" Sort of like how "Squirrel!" always got those doggies in the movie Up. On second thought, unless we were standing in front of the Bellagio in Vegas, she would be doubly ired that there was in fact no water and light show in the vicinity. I would probably opt for a safer bet like "Wanna cupcake?"
An even better idea would be for the sensor to operate more like a home alarm system or a LoJack...or even a Bat-phone...where a call could immediately be placed to my ABA consultant who would rush over to our location coordinates armed with a tool belt full of pre-written social stories, video models, and reinforcer boards. Then and only then would I be looking at shelling out the $2,000 for it. Nah, that's still an awful lot of money. Throw in a pedi and some Xanax for me and you've got yourself a deal.