Portable elliptical?

aliwhalen

http://www.amazon.com/Stamina-In-Motion-Elliptical-Trainer/dp/B00AQ7ZNEA

I have one similar to this, but I don't think it gives me the same workout a gym elliptical gives. I tried looking it up in the database but couldn't find what I was looking for. My machine gives a basic idea of how many calories you burn (although it does it without factoring in WHO is using it), is there a way to add quick calories to exercise? Thanks!