Fitness Bracelet Q8S Heart Rate Smart Band Sleep Monitor Fitness Tracker Blood Pressure Band IP68 Wa worth to buy? Thanks for it if those of you who have purchased Fitness Bracelet Q8S Heart Rate Smart Band Sleep Monitor Fitness Tracker Blood Pressure Band IP68 Wa could share about what you think of the product. I would love any extra info, as it is quite pricey as $19.00 and I just want to know it is good before paying for it.