Meta announced a Tamagotchi-like pendant for interacting with its Muse personal agent on Wednesday. The device, expected to be out in time for Christmas, features a customizable character at the center of the screen. It can be worn with a wrist strap, carried in a pocket, or attached to a bag or keychain with a lanyard. The devices can interact with each other when placed near each other. Muse Charm could open up new streams of revenue that could eclipse the company's advertising business.