Homematic IP Universal Dimmer Attachment - Motion Sensor #162335A0 Automatically dim lights when motionis detected With the Homematic IP Universal Dimmer Attachment - Motion Sensor, used in combination with the Universal Dimmer Module, you can conveniently control and dim your lighting in your smart home. 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.