T4 Fitness Tracker with Real-time Temperature Monitoring Heart Rate Smart Band Call Reminder Smart B worth to buy? Thanks for it if those of you who have purchased T4 Fitness Tracker with Real-time Temperature Monitoring Heart Rate Smart Band Call Reminder Smart B could share about what you think of the product. I would love any extra info, as it is quite pricey as $19.99 and I just want to know it is good before paying for it.