Question: what is the difference between the iwatch series?
Answer: But here's the big difference: Series 2 (right) is swim0-proof to 50 meters, and has built-in GPS, Series 1 (left) doesn't. Both watches feel the same; Series 2 has a brighter display, though. Series 1 (bottom) is a bit thinner than Series 2 (top), but its battery life is also a bit less.