The Beru Mercedes Diesel Glow Plug Controller - GSE116 is a high-quality electronic device designed specifically for use in Mercedes diesel engines. It is responsible for controlling the glow plugs, which are essential for starting the engine in cold weather conditions. The controller ensures that the glow plugs are activated for the correct amount of time, providing optimal heat to the engine for a smooth start. It is compatible with a wide range of Mercedes diesel models and is built to withstand the harsh conditions of diesel engines. This product is a reliable and essential component for ensuring the efficient and reliable operation of Mercedes diesel engines.