Answer:
What object has keys that open no locks, space but no room, and you can enter but not go in?
What fastens two people yet touches only one?
What was the first man made invention that could see through a wall?
It carries paper of the most important sort but also plastic, I'm glad to report. What is it?
It speaks without a tongue, and listens without ears.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?