Glass breakage sensor for Prius

Has anyone installed it. I know you must have the factory security system on the car. Here in DC all of them come with the factory security system. The only option to add to the car as far as security goes is a point of entry(port facility) or dealer add on glass breakage sensor. You can buy it from Toyota Parts for about $75.00(online dealers). The description says it come with instructions.
Anyone know of the sensor intergration into the car let me know!
Thanks