Fairday's Riddle: Gearing Up...

Hello, Riddlers! Can you guess our theme? I am a fan, and always find them to be (head tilt), "Interesting." 😉 

Mechanical buzz; click clack sprocket, taller than a building or fits in your pocket. Enter Data for computing the measure, or press for refreshment at your pleasure.  Metallic moves and electric veins, sparked by those who steer tech reins. 

What am I referring to? Stop by Friday for the answer.

I gave you a clue!

FEAR NOT THE UNEXPECTED