Abstract: A steering device for a surfboard includes a steering unit, a driving unit and a transmitting unit. The steering unit is operable for controlling a movement of the surfboard. The driving unit includes a base seat secured to a board body of the surfboard, a rotatable linking member disposed in the base seat, and a drive arm mounted with a handle. The drive arm is rotatable and substantially untwistable, is connected to the linking member, and extends outwardly of the base seat. Rotation of the drive arm drives the linking member to rotate, thereby driving operation of the steering unit via the transmitting unit.

Abstract: A water motorcycle includes a motorized surfboard unit having a deck portion and driven by a drive motor, and a motorbike frame unit detachably mounted on the deck portion by means of retaining hook units. The motorbike frame unit includes a seat module provided with a rider's seat, and a handle module provided with an upright handlebar frame. The surfboard unit can be used independently for surfing or combined with the motorbike frame unit to function as a water motorcycle.

Abstract: A boat includes a boat body and an accompanying device. The boat body includes a hull defining a first accommodation space and having left and right sides, an electric motor disposed on the hull, and a propulsion unit driven by the motor. The accompanying device includes at least one carrier assembly. The carrier assembly includes a carrier attached to either the left or right side of the hull and disposed outwardly of the hull so as to define a second accommodation space, and a battery set disposed within the second accommodation space and connected electrically to the motor for supplying electricity to the motor.

Abstract: A rehabilitation exercise device includes a head support unit having a head cushion adapted to support the head of a user, and a frame holding the head cushion and having two opposite connection ends. Two side cushions are disposed respectively on two opposite sides of the head cushion, and are connected pivotally and respectively to the connection ends so that the side cushions are rotatable toward or away from the head cushion. A biasing unit is connected to the side cushions to bias the side cushions to rotate toward the head cushion.