A DALI-2-certified manual control unit for flush-mounted installation that enables switching and dimming (1…100%) of luminaires with a DALI interface. It supports up to 25 DALI ballasts directly, or up to 100 when using four rotary dimmers in parallel, and allows synchronised manual operation from multiple control points without the need for software or an app. A preferred setting can be stored by double-clicking the rotary knob.