F4 0.96inch OLED Touch Screen Display Bluetooth Sports Smart Bracelet, IP68 Waterproof, Support Bloo worth to buy? Thanks for it if those of you who have purchased F4 0.96inch OLED Touch Screen Display Bluetooth Sports Smart Bracelet, IP68 Waterproof, Support Bloo 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.