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We were robbed & assaulted during December 2014 and further security devises was necessary to Arm ourselves with doberman window alarm. I purchased 12 units to install them on all windows and was surprised of the loudness of the siren alarm and ease of installation. Unfortunately the cleaning lady " borrowed " 4 of those units from the windows w/o our knowledge and i had to replace them quickly. The units arrived today ( 5 days prior to promised delivery time) and were quickly installed. The am sure that when the intruder make a plan to break the window , they will be faced with scary loud noise , they will think it twice. It was the cheapest way to buy extra security , i also gave away two widow units to a soldier's family who were agitated by the recent criminal activities in this area.