M4 0.96 inch Bluetooth 5.0 Smart Bracelet, Support Call Reminder / Heart Rate Monitoring / Blood Pre worth to buy? Thanks for it if those of you who have purchased M4 0.96 inch Bluetooth 5.0 Smart Bracelet, Support Call Reminder / Heart Rate Monitoring / Blood Pre could share about what you think of the product. I would love any extra info, as it is quite pricey as $22.00 and I just want to know it is good before paying for it.