It used to be the only way you could detect breaking glass during an intrusion was with a "special glass break detector" mounted on a nearby wall or ceiling. That's not true anymore.
The IQ Panel 2 has dual microphones and a quad core processor and software that leverages both of these as a built-in glass break detector. When the panel is armed and a window is broken within 15 feet of the IQ Panel the microphones "hear" it and trigger the alarm. It doesn't cost anything extra, and with the powerful processor and over the air software updates we are able to improve the sensitivity and glass break recognition over time.