Radio brightness sensor with battery, white. Quicklink brightness sensor for surface mounting as a radio solution in the 868 MHz range with quicklink radio products as a tool-free quicklink configuration using buttons with LED display or integration via KNX radio media coupler in the KNX-TP system. The brightness sensor can be reset to the factory settings. Supply voltage using 2 AAA LR03 1.5V batteries. In addition, the low battery message is displayed on the front LED display and the configuration is saved when the battery is changed. An external reed contact can be connected. The information window open or closed in frost protection mode of the heating, upward movement of the roller shutter, scene can be controlled via the respective KNX object. Activation/deactivation of the automatic mode is possible using the button on the front of the device.