A uniquely simple, inconspicuous, sturdy lock works where doors or windows slide from side to side. So simple people do not believe it works until they see it in action. It is secure enough to keep burgulars out and police impressed. Babysecure clients who have had robberies tell us how robbers, unable to get in where this lock was installed, had to move on to find another way in. Made of transparent Lexan, part of the device fixes with sturdy adhesive to a flat surface. The other half folds at right angles to block anything trying to slide past it. When you want to unlock, snap this second piece back down flat out of the way. It needs 3/8" of clearance between doors. Use on sliding or double hung windows, patio doors, sliding mirror, shower, and closet doors.
view video about applications and installation - http://addalock.com/burglabar/burglabar-video.html
See ATTACHMENT below for more details and information about installation.