Hmmm, I wonder what my TCH was doing with the horn beeping and lights flashing?

Seriously, I've set off the TCH factory alarm - so I know it has one! I had locked the car with the drivers window down. A few hours later I went out to the car without my keys and just reached in and opened up the car. About 10-15 seconds later the horn and lights started going off. I had to go get the keys to silence the ruckus.