The Fitbit Flex 2 pendant is made from stainless steel. The gold pendant is 22k gold plated. A built-in magnet lets your tracker know you’re using a non-wrist-based accessory so it can track your steps. Certain features like auto sleep tracking and SmartTrack™ may be disabled in this accessory.
Magnets may interfere with pacemakers, defibrillators, or other medical devices. Consult your physician and the manufacturer of your medical device before using to determine if this accessory is safe for you. If the accessory may be interfering with your pacemaker, defibrillator, or other medical device, do not wear it.