On the other hand, if someone was wearing this bracelet to keep cool while in a hot area for an extended period of time, isn't it possible that they could feel

On the other hand, if someone was wearing this bracelet to keep cool while in a hot area for an extended period of time, isn't it possible that they could feel cool while actually becoming hyperthermic (and possibly dying)? Or the inverse, where they are feeling warm while they are going hypothermic? Perhaps some sort of safety control that shuts the device off beyond a certain set of conditions would be advisable in a final product.