The document summarizes the technical specifications and features of the Sennheiser ENG 100 Series wireless microphone system. The system includes a choice of bodypack transmitters or plug-on transmitters that can connect to various clip-on or handheld microphones. Key features highlighted are long battery life, a wide switching bandwidth for multiple compatible frequencies, and a diversity receiver for optimal sound reception even in difficult conditions. Accessories and variants that can be chosen are also listed.