D13 1.3 inch OLED Color Screen Smart Bracelet IP67 Waterproof, Support Call Reminder worth to buy? Thanks for it if those of you who have purchased D13 1.3 inch OLED Color Screen Smart Bracelet IP67 Waterproof, Support Call Reminder could share about what you think of the product. I would love any extra info, as it is quite pricey as $16.40 and I just want to know it is good before paying for it.