Congrats on your luck, getting a camera. About to get film and get them processed, I would go to a professional studio and ask for the info, actually I did, usually they are extremely helpfull. I use my Etr, Etrs and Etrsi both with hand cranck, speedgrip and with motor. The speedgrip do not have batteries, the plate that sits under the camera is only about 5 mm thick. If you are in doubht what you have, speedgrip or motor, go to Ebay, and look for "etr speedgrip" or "etrsi motor" and you should have results to determine what you have.