Romer-G Key Switches and Precision Key Lighting Logitechs exclusive Romer-G mechanical switches are purpose-built for pro-grade performance, responsiveness and durability. With a short-throw actuation point of 1.5 mm, Romer-G switches register key presses up to 25 percent faster than standard mechanical switches, so you can get your shots off faster than your opponent. Romer-G switches are also purpose-designed for precise and clean lighting through the keycaps, so they are always visible but never distracting.