DTNO.1 G12 1.3 inches OLED Color Screen Smart Bracelet IP67 Waterproof, Steel Watchband, Support Cal worth to buy? Thanks for it if those of you who have purchased DTNO.1 G12 1.3 inches OLED Color Screen Smart Bracelet IP67 Waterproof, Steel Watchband, Support Cal could share about what you think of the product. I would love any extra info, as it is quite pricey as $39.70 and I just want to know it is good before paying for it.