A DALI-2-certified control unit for flush-mounted installation in standard boxes that enables manual switching, brightness adjustment (1…100%) and colour tuning of luminaires with DALI DT8 ballasts. Compatible with exchangeable covers from various switch manufacturers, it supports up to 25 DALI ballasts directly or up to 100 when four rotary dimmers are connected in parallel. It allows synchronised manual operation from multiple control points without software or an app, and offers the option to store a preferred setting by double-clicking the rotary knob.