Portable USB Charger for Fitness Activity Tracker Smartwatch Charging Cable Cord Clip Charger worth to buy? Thanks for it if those of you who have purchased Portable USB Charger for Fitness Activity Tracker Smartwatch Charging Cable Cord Clip Charger could share about what you think of the product. I would love any extra info, as it is quite pricey as $7.24 and I just want to know it is good before paying for it.