Glass Break Alarm by Mace Window Alert The Mace Window Alert uses a micro-technology glass sensor to detect bumps and the breaking glass it is mounted on. The 95db alarm turns on for 45 seconds then automatically shuts off. This Mace alarm is great for detecting glass breakage on sliding doors, too. Use it anyplace a glass break could occur to alert you to unwanted intrusion.
Priced less than Walmart and no tax if outside Tennessee.
Has "On-Off" switch.
Sticky Tape and battery are included. (Battery is replaceable with Eveready A76 or equivalent)These are "button" batteries and inexpensive.