So imagine you have two things, like your hands. They can touch each other easily because they're made of skin, which is a type of material that lets electricity pass through it easily.
But some things, like plastic, don't let electricity pass through them easily. That means if you put your hands in plastic gloves, they can't touch each other anymore.
The same thing happens with electronic devices - some parts need to touch each other to work properly, but they can't if they're separated by something that doesn't let electricity through.
This is where EIA Class 2 Dielectric comes in. It's a type of material that's good at letting electricity pass through it, but not TOO good. You don't want electricity shooting through your electronic devices like crazy, because it can cause all kinds of problems.
So EIA Class 2 Dielectric is just a special kind of material that helps parts of electronic devices stay in touch with each other, while also keeping the electricity under control.