KINGWEAR KW20 Female Physiological Reminder Continuous Heart Rate Monitor IP68 Waterproof Smart Watc worth to buy? Thanks for it if those of you who have purchased KINGWEAR KW20 Female Physiological Reminder Continuous Heart Rate Monitor IP68 Waterproof Smart Watc could share about what you think of the product. I would love any extra info, as it is quite pricey as $59.33 and I just want to know it is good before paying for it.