For System M. Push button module without rocker. With programmable status display. The device is connected to the bus line via a bus connection terminal. With integrated bus coupler. KNX software functions The buttons can be parameterized either as a pair of buttons (two-surface) or as individual buttons (single-surface). Single-surface switching ON or switching OFF, dimming, scenes. Two-surface switching ON, switching OFF, dimming, scenes, blinds. To be completed in KNX with rocker for 1-way button module System M 6191xx, 6251xx Rocker for 1-way button module with 1/0 imprint System M 6254xx, 6193xx Rocker for 1-way button module with up/down arrows imprint System M 6255xx, 6194xx.