The invention relates to an armrest element of a seat, in particular of a vehicle seat, having a base body, the armrest element having at least one first connection interface of predetermined design to which at least one exchangeable extension module having a second connection interface of predetermined design can be fixed, the first connection interface and the second connection interface being designed in such a way that at least one detent connection is made possible between the first connection interface and the second connection interface.

A seat includes a seat frame, a pad body, and a power generation device. The pad body covers the seat frame. The power generation device is arranged on an occupant-side of the pad body and generates electric power from vibrations. The seat may further include an outer covering that covers the pad body. The power generation device may be located between the pad body and the outer covering.

A vehicle armrest device for supporting a driver's arms while the driver is driving a vehicle includes a support strap that is positionable around a backrest of a seat in a vehicle. A first armrest is attached to the support strap thereby enabling the first armrest to be positioned upon a center console of the vehicle to support a driver's right arm when the driver is seated in the seat. A second armrest is attached to the support strap thereby enabling the second armrest to be positioned between the seat and a driver's side door of the vehicle to support the driver's left arm when the driver is seated in the seat.