A:AnswerSo you may get a trade in value for your first Fitbit, but that would require you paying the difference from that to the charge HR. Hope this helps a bit
A:AnswerIt's like a belt. It can be tightened and loosened. If your exercising it should be three finger tips away from the wrist bone for a good reading. To track heart rate, it should lay flat, a finger tip width above your wrist bone.
A:AnswerPer the Fitbit moderators on their website, a limited amount of BLACK Charge HR will be released in limited stores (possibly Best Buy) in the next few days. Call Best Buy for a better idea of when they will be available.
A:AnswerFrom the app: "How does Fitbit count floors? Fitbit trackers count one floor for when you climb about 10 feet at one time." Based on this information, and since you're not technically gaining any real altitude on a stair master, I would guess no.
A:AnswerAccording to the Fitbit website, the Charge HR is available to the general public early 2015. Only pre-release models for review have been released.
A:AnswerYes. Just like Santa, it knows when I'm sleeping and when I'm awake. I think it's based on heart rate so I don't have to set it. It's pretty accurate most of the time. You still have the option of adjusting sleep times manually on the app too.