If you're not concerned about your privacy, some wireless wearables have also been recalled for burning wearers and ALL OF THEM emit biologically harmful electromagnetic fields (aka "Electrosmog"), Bluetooth, and wireless "Wi-Fi" radiation.  In fact, manufacturers are required to provide warnings about exposure risks. Nevertheless, "Smart" wearables continue to be created and promoted to unsuspecting consumers, now even by a soccer club.  Boo!