Pry off the backplate (which bends and flexes like the cases on Samsung's latest smartphones, but comes off far more easily) and you'll find a microSD slot.
The faceplates snap firmly into place, but you'll probably need the help of a coin to pry them off -- we still prefer the magnetic connection that Astro uses, rather than the snap-on designs from TB and Tritton.
Dr. Peter Vincent Pry is President of EMPact America, Director of the U.S. Nuclear Strategy Forum, and served on the staffs of the EMP Commission, the Strategic Posture Commission, the House Armed Services Committee and the Central Intelligence Agency.