When designing the fosera. EVO, the focus was on a particularly uncomplicated, low-cost manufacturability that nevertheless meets all requirements for robustness and modularity. With three main housing parts, the design of aroma:id allows for operating the system purely with a lithium battery (in the upper housing) or in combination with a lead battery (in the lower housing part). The distinctive indentation on the side of the housing fulfils several functions: In addition to increasing the stability of the body, it forms recessed grips that make fosera. EVO easy to carry. This shape is continued on the upper part of the enclosure and forms two indentations on the sides. Screw holes are integrated here for fastening the upper part of the housing to the wall or to the lower housing part. At the same time, the design emphasises an important functional area, as this is where the slots are located namely fosera. jack and USB for connecting various devices. Furthermore, this reduces the width of the module's board, which is another advantage. The operating interface has only one push-button, which is enclosed by a rotary dial. In combination with the economical LCD pixel display, it allows for an easy, intuitive operation of all functions of fosera. EVO.