A milling head has a body, a holding device, a driving axle, a spraying device and a tool adaptor. The present invention provides an electronic display with multiple pre-programmed messages. Detector looks towards the scene through a mask. The load ring also has a radially outer surface including a frustoconical cam surface. Optionally, the container system may have an inner and outer wall element providing additional strength and rigidity and may also have a liquid container stored therein.