This is a set of 2 release keys to release the Audio-10, Audio-30, Audio-30-APS or COMAND 2.0 systems from Mercedes vehicles. They slide into the slots at the side of the head unit, and then you can pull the unit out.

They are also useful for the W211 (new E class) Navigation drive and R129( SL), W208 (CLK) W210 (E) air conditioning controls.