This is a multi functional wireless laser presenter.
I) Press the "Power" button to switch on the presenter directly, it's a tomer with display (please see RED words in the photo, each button's function)
II) With the "M" button on the back face pressed, Press the "Power" button to switch on the presenter, there are 2 modes of functions of the laser presenter by switch the "Shift(M1/M2)".
M1: PPT Play/Exit,Black Screen (On/Off), Page UP,Page Down, laser pointer, Volume +, Volume -.
M2: Windows Shift,Window Minimized,Page UP,Page Down, laser pointer, Line Up, Line Down