A:AnswerThe heart monitor has two functionalities. The first one is measuring you heart rate which works all time in the background or you can request a measurement manually. The second is the ECG that has to be manually requested and you have to hold your finger in the crown button.
A:AnswerI bought an open box of this same model and in my case it was brand new. It was obvious that it was a gift for someone that didn’t want it and was only looked at it. It had never been powered on and had zero fingerprints on it. Well I’ve had mine for 6 months now and have no regrets, it has always worked flawlessly. I’m still enjoying the fact that I saved a worthwhile amount of cash buying with the open box options. Besides if Best Buy sends you one that’s less than perfect they would take it back and try again.