The Ledvance DALI MCU TW G2 Tuneable Dimming Switch is designed to control up to 25 x DALI-2 LED light fittings via a manual rotary push and twist design (similar to traditional push and twist leading edge and trailing edge mains dimmers). Unlike mains dimmers, these DALI dimmer switches by Ledvance allow you to manually control DALI-2 LED light fittings without the need to have digital software via a tablet or computer system to control the light levels.