Switch actuator for shading elements and roller shutters with 2 channels for two 230V motors. 2+2 normally open contacts, 4A/250V AC, not potential-free. Encrypted radio, bidirectional radio, and repeater function can be activated. Standby loss is only 0.8 watts. Installation in the 230V mains connection line, for example in false ceilings and lights. Dimensions: 166 mm long, 46 mm wide, and 31 mm deep. With cable strain relief. Contact switching at zero crossing to protect the contacts and motors. One motor is connected to 1, 2, and N, while a second motor can be connected to 3, 4, and N. In the event of a power failure, it is switched off definitively. The buttons can be learned either as direction buttons or as universal buttons: Local control with universal button: With each pulse, the switching position changes in the order of Up, Stop, Down, Stop. Local control with direction button: A pulse at the top specifically activates the Up switching position. A pulse at the bottom specifically activates the Down switching position. Another pulse from either button interrupts the process immediately. Central control dynamically without priority: With a control signal from a button learned as a central control button without priority, the Up position at the top or Down position at the bottom is specifically activated. Central control dynamically with priority: With a control signal of at least 2 seconds from a button learned as a central control button with priority, the Up position at the top and Down position at the bottom are specifically activated.