Other than a great looking collar, the main reasons I was sold on this collar was the "on the collar" design for the Fi module and the ability to charge without removing the Fi module. With the Fi 2 and module it isn't possible to charge while attached to the collar, I don't know if the original Fi module and charging base were a different size or shape? I would also like to see a collar with reflective stitching or fabric. If my pup were to be lost, I really want something reflective should he be running along or across a road in the dark.