Homematic IP Universal Dimmer Attachment - Motion Sensor, Anthracite #162343A0 Automatically dim lights when motionis detected With the Homematic IP Universal Dimmer Attachment - Motion Detector, you can conveniently control and dim your lighting in your smart home when used in combination with the Universal Dimmer Insert. The integrated motion and twilight sensor enables automatic lighting control based on motion and ambient brightness. You can also manually operate your lighting at any time using two buttons.