Color Display Smart Watch Heart Rate Blood Pressure Oxygen Monitor Bluetooth Wristband Call Rejectio worth to buy? Thanks for it if those of you who have purchased Color Display Smart Watch Heart Rate Blood Pressure Oxygen Monitor Bluetooth Wristband Call Rejectio could share about what you think of the product. I would love any extra info, as it is quite pricey as $38.99 and I just want to know it is good before paying for it.