Jose: "So, what's an electric cajon?"

You're spelling Cajón wrong there José.

It's a type of South American "box drum."

Peruvian percussionist, José "Pichio" Ballumbrosio

It was once quite popular in the Caribbean as well but often played a la "hambone" with Djouba (Juba) style thigh and chest slaps mixed in. Any old wood packing crate or box would do in a pinch.

Later, metal "biscuit tin" cajóns were a kind of proto-steel drum (pan.)