A burglar can't open your doors or windows without setting off the door/window contacts, but what happens when he gains access through a broken window? Detect the sound of breaking window glass in your home. This unit recognizes the pattern of glass breaking across the full audio band. Perfect for homes with many windows, this protective device employs a patented acoustic pattern recognition technology for up to 20 feet in a 360 range. Enabled with a unique ID command code and available in various frequency ranges in compliance with international standards.