Combination box/switch - two wires only
There doesn't appear to be a grounded (neutral) conductor in the box.   Looks like it's a simple switch loop, that somebody tried installing a combination receptacle on. It looks like the black wire is an ungrounded (hot) conductor, and the white wire is a switched ungrounded (hot) conductor. 

There's no way to add a receptacle here, unless you pull a grounded (neutral) conductor to the box.

The top black screw on the device (middle of side one), is the ungrounded (hot) conductor going to the switch.  This screw is connected to the bottom black terminal via the copper tab, which provides power to the receptacle. The top black screw is also connected to the upper brass screw through the switch. When the switch is closed, electricity can flow "in through the black screw and "out" through the upper brass screw.  This supplies switched power to the light fixture.

The middle screw on the other side of the device, appears to be a grounding screw.  The lower screw is where the grounded (neutral) conductor should be attached.  This provides the grounded (neutral) connection, which is required to make the receptacle function properly.