The KNX IO 534 (4D) is a compact RGB, RGBW and Tunable White dimming actuator with 4 PWM outputs. The dimming actuator can be used for LED panels or strips with RGB / RGBW / Tunable White configuration or as 4 independent dimming channels. Each configuration allows control via switching telegrams, relative dimming and dimming value. In addition, several convenience functions are integrated, including scenes, snooze function, staircase light and sequencer. Two buttons and three LEDs enable local operation and visualization of the device status. In addition to the output channels, the device has 16 independent functions for logic or time control.