I got this part, ultra white purchased as an accessory for Rademacher 14234511 RolloTron Standard DuoFern to control the shutters with FHEM can. The Rademacher Office had not paid off. Along with a simple actuator and some logic in driving a sufficient ease of use is achieved. This part is described clearly, easy to configure and works, as it should be, without interference in weeks. Better than the similar interfaces for HomeMatic I like the configurability of the control unit (buttons, switches, input / two-channel operation).