Kuster Ingenieurbüro is a specialized electronics firm led by Thomas Kuster in Rorschach. The company offers services in the development of electronic control units, power supplies, transducers, and electronic assemblies. A significant focus is placed on innovative projects such as the market launch of lithium batteries for electric vehicles (e.g., in Nepal). Additionally, Thomas Kuster operates the 'Audiowerkstatt', dedicated to the development and manufacturing of custom speakers, microphones, and home cinema systems.