It looks like a radar detector. It sounds like a radar detector. But it's not a radar detector. It's the ultimate gadget for those frustrated by other drivers on the road.
This compact device (runs on batteries, not included) has three switches on it which will sound off when hit. Granted, it's a gag gift, but it really works to relieve frustration when that old wobbly on your right tries to make a left turn in front of you. And it's safer than using a shotgun (something that people in California seem to favor when they're driving).