K1 0.66 inch OLED Display Bluetooth Sports Smart Bracelet, IP68 Waterproof, Support Heart Rate Monit worth to buy? Thanks for it if those of you who have purchased K1 0.66 inch OLED Display Bluetooth Sports Smart Bracelet, IP68 Waterproof, Support Heart Rate Monit could share about what you think of the product. I would love any extra info, as it is quite pricey as $24.00 and I just want to know it is good before paying for it.