They insert easily and you can't even tell if the outlet is blocked. They are very difficult for adults to remove. I ended up breaking one trying to pull it out (not to mention breaking my fingernails trying to remove the covers from the connector). I can't imagine my toddler being able to remove them easily.
Mommys Helper Curtain Blind Cord
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Fisher Price Shock Guards: Premium Child Safety Outlet Covers - Pack of 30
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KidSwitch Lightswitch Extension For Toddlers - Laurie Berkner Edition: 3-Pack With 12 Themed Art Decals - Multi Award Winning!
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π Improved 10-Pack Invisible Baby Proofing Cabinet Latch Locks - Easy Installation with No Drilling or Tools, Compatible with Most Cabinets, Drawers & Countertop Overhangs, Highly Secure
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Sirius Pro Gravastar Gray TWS In-Ear Headphones with War Damage
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π Childproofing Made Easy: Vmaisi 20 Pack Magnetic Cabinet Locks - Secure Cupboard Drawers with Adhesive Installation
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Gaming computer chair AeroCool Count, upholstery: imitation leather/textile, color: burgundy red
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