Abstract: A keyboard with a host shutdown function includes a storage unit, a timer, and a processor. The storage unit stores a predefined length of time. The processor includes a power detection module and a time control module. The power detection module detects the keyboard being powered on. The time control module records the working time of the keyboard and to send a control signal to the host connected to the keyboard to shut the host down when the recorded duration time reaches the predefined length of time. A control system for the keyboard is also provided.

Abstract: A portable supporting frame includes a first, a second and a third supporting arm. The first supporting arm pivots on a first end portion of the second supporting arm, and the third supporting arm pivots on the second end portion of the second supporting arm. A number of stopper portions are arranged on a surface of the first supporting arm, and a free end portion of the third supporting arm can be engaged with one of the stopper portions when the portable supporting frame is unfolded, to form a triangular support to support an electronic device. A hook structure pivots relative to the first end portion of the second supporting arm, and can be rotated relative to the second supporting arm, to define a receiving space to provide a resistant platform against a bottom end portion of the electronic device.

Abstract: A touch pen also functioning as a support includes a first rod, a second rod, and a positioning rod. The second rod has a first end portion pivoting on a first end portion of the first rod and a second contact surface facing a first contact surface of the first rod. One of the first contact surface and the second contact surface includes a number of positioning portions. The positioning rod has a first end portion pivoting relative to the other one of the first contact surface and the second contact surface and away from the first end portion of the first rod. The positioning rod further has a second end portion configured to be engaged with one of the positioning portions to form an angle between the first rod and the second rod which transforms the touch pen into a supporting structure to support an electronic device.