I am allergic to nickel. I use the Fitbit Zip, but I want something that can track heart rate and sleep. It seems that all of your available wrist products are made with nickel. As this is such a common allergy, I think it would only make practical sense for you to develop a product that doesn't use nickel. With all of the wrist irritation issues plaguing users of fitness trackers over the years, I would encourage you to be a leader in developing a device that is hypoallergenic. I tried a Fitbit Charge and, within minutes, had a red reaction on my wrist. I don't want to buy a device that will irritate my skin and, until you develop a new device, I am going to have to look into other companies' trackers.
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