A:Answer There is a much larger display on the new FitBit HR2; I think it also displays additional information over the old one. The bands are also interchangeable. The main difference, to me, is quality. I had a lot of problems with the FitBit HR charging bracket. The charging bracket kept coming apart with the power cord. BestBuy replaced it once, then it was out of warranty. The rubber molding was falling apart, it looked terrible, then the charging bracket fell off and was lost, so it could not be charged. This was after about a year of wear! The HR2 doesn't have these design flaws and seems much improved.