The invention relates to an apparatus (2) for transmitting electrical signals to and/or from a rotatable component of a motor vehicle, having a positionally fixed stator (4) which is intended to be installed in a positionally fixed manner in the motor vehicle, and having a rotor (3) which is rotatably mounted on the stator (4) and which is intended to be coupled in a rotationally fixed manner to the rotatable component of the motor vehicle, wherein the stator (4) has a housing (5) in which a flat cable (14) for transmitting the electrical signals is arranged, wherein a connecting piece (6) which is electrically coupled to the flat cable (14) and is designed to be connected to a corresponding mating piece (15) of the rotatable component is arranged on the rotor (3), and wherein the rotor (3) has a viewing window (11) through which it is possible for a viewer looking from outside the housing (5) to identify a reference element (13) of the flat cable (14) in a neutral position of the rotor (3) with respect to the stator (4), wherein the viewing window (11) is arranged in the region of the connecting piece (6), so that the viewing window (11) is covered by the mating piece (15) in a state in which the connecting piece (6) is connected to the mating piece (15).