Spring return, cable lock, wall bracket swivels 180°, can be mounted in any position. Specially designed with slip ring and cable for the transmission of digital and video signals. The brushes of the slip ring have a low peripheral grinding speed at the contact point between the brushes and rings, a low concentricity deviation and are therefore subject to very little wear. The contact points are coated with a gold alloy, which reduces noise and interference between circuits. The cable is shielded.