W.1 group button bus coupler, 2-way, rocker with center position, four switching points. Surface-mounted or flush-mounted bus coupler button with integrated bus coupler, bus connection via connection terminal, red status LED and illuminated programming button. Function for manually interrupting automatic functions that have already been triggered. Easy function: 'Single button function' operating concept is fixed, operating concept for 'roller shutter/blind' function is fixed, switching of scenes (1 to 8) is possible. Button function: Switching, dimming, roller shutter/blind, timer, forced control, operating mode switching. ETS functions: Control surfaces can be configured as buttons (single-surface operation) and rockers (two-surface operation), status LED brightness can be individually adjusted for button/rocker function, brightness value of status LEDs for day/night operation can be adjusted via object or manually. Button/rocker functions: switching, dimming, roller shutter/blind, value transmitter 1/2 byte, room temperature controller extension, forced control, scene, deactivate automatic. Locking function can be parameterized.