The warm copper tones and glossy black surface define the appearance of the r157. Integrated voice transmission allows a reduced button layout and forms the basis for the compact, well-balanced shape. Thanks to improved power efficiency, the r157 can be operated with only one battery instead of two. This saves seven tons of toxic waste per year for every one million remotes. Supported by data transmission via Bluetooth Low Energy, the input device is an example of integration between the latest technology and emotional design.