A device to dispense active substances into rinse water, especially in toilet bowls, with a container for the active substance, wherein the container has an opening that connects with an essentially plate-shaped distributor, and with a device to hold the distributor on or close to the toilet bowl wall. The software architecture can be utilized for developing in-vehicle software applications for installation and execution on an in-vehicle computer system. The needle-protruding surface of the adjustment unit is formed such that the distance S from the circumferential edge to the circumferential surface of the needle tube is in the range of 0.