Key innovations of the GH2720QR Bird Watching head, are the new Bird Watching Fluid Cartridges, the Single Lock System and the ultra-precise inner mechanism. Pan and Tilt Fluid cartridges are completely new and offer a completely opposite behaviour than the traditional video ones. These innovative cartridges guarantee a ultra smooth and controlled movement at very low speed (exactly what Bird Watchers are looking for), while at high speed the movements become almost completely free, and this is very useful when a fast equipment repositioning is required.