Abstract: An electronic device includes a first body, a second body, a hinge structure, a pivot bracket, and a third body. The hinge structure is pivotally connected to the first body and the second body, and the second body is adapted to rotate along an axis relative to the first body. The pivot bracket includes a pivot portion and a fixing portion, wherein the pivot portion is pivoted to the hinge structure. The third body is fixed to the fixing portion of the pivot bracket, so that the third body is adapted to rotate along the axis center relative to the first body.

Abstract: A power output device includes a spindle for attaching to a fork of a wheeled vehicle, a housing for attaching to a wheel and rotatably attached onto the spindle, a container disposed in the housing, a stator disposed in container, a rotor rotatably attached to the spindle, a gear attached to the rotor, a gear wheel secured to the container, a number of pinions engaged with the gear and the gear wheel and attached between two plates, an output shaft attached to one of the plates and attached to the container, and a control device having one or more batteries attached to the container, and an electric mechanism for operating the rotor and the gear to rotate relative to the stator and to rotate or drive wheel of the wheeled vehicle.