I purchased this for my home, but I'm selling it because I'm not using it. Just stick it on the window! Easy crime prevention! Model Number: ASA-W13-N4P Product Features: ● This is a dual-detection type that sounds an alarm when glass is broken or impacted, and when the window is opened. ● The impact detection only detects glass breakage and impact, so there is no worry of false alarms due to vibrations from rain, wind, or the passage of large vehicles. ● When glass breakage/impact or window opening is detected, a loud alarm (approx. 90dB/50cm) will sound for about 25 seconds. ● Easy installation, just stick it on with the included double-sided tape. Will be sent via postal mail.