The outlet cover is held securely in place by posts on the back that align with the ground openings of the socket. It as well requires no tools for installation or removal which makes it very easy for insulation. I as well love that these products are made in the USA. Not only is it great for childproofing, but I have one socket that the color does not match the rest of the house, and with the Coverplug paintable outlet covers, it makes it virtually disappear. This product definitely gets 5 stars, and I would highly recommend this to any expecting parents or anyone wanting to childproof their home.
If you would like to check out this product, or purchase one for yourself to protect your little one, check out the following link: http://coverplug.com or http://www.amazon.com/COVERPLUG-2-Pack-Electrical-Outlet-Cover/dp/B00MTVDARS/ref=sr_1_1?ie=UTF8&qid=1415050483&sr=8-1&keywords=coverplug
I received this in exchange for my honest and unbiased opinion.