Safety InnovationsChildproof Your Windows and Sliding Doors with Our Window and Door Babyproof Safety Lock, (8-Pack)

Easy to install, work well, however my son has a much harder time lifting the window than he does figuring out how to flatten these things. He was 2 when we bought these and now he's three, but he's been able to climb up on the window for awhile now and he figured out rather quickly how to get around these things. He's still not strong enough to lift up the window though. In search for something better before he's strong enough.Sorry, I don't give 1 star reviews ever, I do think the quality is good, it's just that they're literally not child proof at all so they don't work as intended. It's a fairly important product people are buying here so I want to be honest.

These are incredibly easy to install and adhere awesome to glass! I have 3 under 5 and they were always trying to open windows, doors, etc.. Didnt want to spend a fortune on hardware solutions, so purchased these to try out. Best thing I've seen. For larger doors, use 2. Windows? One on each side cures that problem. Will be buying more when we move to the new place!

These little locks work very well. The stalker found he could not get past them. I need to edit, I thought it would detour my neighborhood thief and he’s found a way to by pass and again help himself to my belongings

The simplest yet incredibly strong and effective!! I have big windows that open low. Remember use one on EACH side of the window as the instructions state. My son can't even reach them ( for one I have nothing near the windows for him to climb) but if your child can reach them having at least 2 on each window will help ensure your child from opening.

I have low second story windows that overlook a paved patio space which always made me nervous with small children. These windows locks will prohibit the windows from being opened wide enough for little bodies to slip through. I appreciate that they are clear, but you can definitely see them on the window.

Careful these did not work on most of my windows.

The photos show them mounted on the glass, but we have vinyl solar protection. So I mounted them on the frame of the window, and they still were perfectly

Nice and simple as it should be. Suck right on the window and gave me piece of mind knowing my son can only open his window so far. A must have if your child has some kind of access to a window in his/her room.