A pulse width modulation control circuit is disclosed. A device for measuring exercise level and fatigue during exercise, which device includes sensors for measuring electrical signals from active muscles and a feedback device for giving feedback. By using the above technical solution, it is enabled to implement transmitting unicast services on an MBSFN subframe while achieving a balance between power saving and implementation complexity, without affecting the existing protocol. In this way, the semiconductor elements are disposed into the recessed portions in the substrate in a self-aligned manner. Vehicle data is communicated from the memory to one of the mobile wireless communication transceivers that is in the vicinity of that vehicle unit. The first side wall of one panel initially comprises first and second vertical legs and a nail strip connected to the bottom of said first vertical leg.