Z02 1.3 inch IPS/TFT Color Screen Smart Bracelet IP67 Waterproof, Support Call Reminder/ Heart Rate worth to buy? Thanks for it if those of you who have purchased Z02 1.3 inch IPS/TFT Color Screen Smart Bracelet IP67 Waterproof, Support Call Reminder/ Heart Rate could share about what you think of the product. I would love any extra info, as it is quite pricey as $29.70 and I just want to know it is good before paying for it.