The inventive slit-lamp unit comprises a table, a cross-slide which can be displaced with the aid of a guide lever, a head holder, a microscope which can be rotated about an axis of rotation, and an illuminating means fastened on a holder. The antenna assembly comprises a first conductor forming at least a portion of an antenna radiating element, a second conductor, and a dielectric disposed between the first conductor and the second conductor, such that the first conductor, the second conductor and the dielectric form a capacitor. The sheet stackable bin includes a first rail to guide the first edge guide, a second rails to guide the first edge guide, and teeth arranged along the first direction. This device allows the use of a cordless telephone without the need to be connected to a wired telephone land-line.