I tend to ,lose my keys so my BIL the Locksmith makes a copy and keeps them on hand in case i do an oh shit. I took my latest car key to him thinking metal key, plastic fob, cheap copy. oh my word! Plastic don't mean plastic anymore for a key end/handle/grab part. it's electronic. Riiiight. "It's plastic.' I told him. "Nope," says he, "It's all electronic."
The last time I saw an "electronic key" there were small old contacts and the electronics were obvious. He showed me a clear plastic end demo key and there is some electronics in it. A small radio frequency thingie. You can't take one of these keys in and expect your local hardware store to grind the profile and expect it to work. It's a involved process that includes a rip out to the car and programming the new key to the car.
The key blank is $16 his cost, the grinding and programming get tacked on. Mind blowing. It's damned good thing I make some Pinto Bean soup he LOVES. heh, it's even better I took a few bowls of it out to him with the key! LOL A real eye opener on the way the world is changing and we never realize. The last key he cut the blank was less than a buck.