This pack of Window and Door Wedge Locks from Toddleroo by North States comes with 4 wedges. They install without tools and can be used in double hung windows or sliding windows and sliding doors to prevent small children from sliding them open.
Pack of 4 wedges
For children ages 6-24 months
Wedges can be placed in sliding windows and sliding doors and double hung windows to prevent children from opening them for added safety