The Speed Alert is a well sorted, simple to operate, complete design. The Product Graphics are cleverly placed on the removable, transparent screen which permits the casing to be used for other products in the family. The graphic interface is astonishingly simple with both a size and colour hierarchy to emphasise the most important information. The functions of the three buttons controlling the menu driven interface are self-evident and their distinct, raised shapes make menu navigation easy. This simplicity of use, like all good design, disguises the advanced technology implicit in this product.