US Patent 11838716 Headband accessory

An electronic device such as a pair of headphones may be configured to be worn on a head of a user. The headphones may have a headband and earcups that are coupled to the headband. The headband may have a frame and a headband frame cover that is removably attached to the frame. The cover may have protrusions, may be inflated using a pump, may include a battery and other components, and may include sensors. An earcup movement synchronization mechanism may be used to synchronize movement of a left earcup with a right earcup. A torsion spring with a stop mechanisms or other bend limiter may be configured to prevent overbending of the headband.