LEOSound is a special developed new respiratory diagnostic system. The system is able to record and analyze cough, breath- and lung sounds over a long period. The device is battery-operated, small and compact and allows a smooth ambulatory or stationary recording for children and adults. Three highly sensitive Surface Microphones are available for recording, which respond to structure-borne sound. The microphones will be stuck on the thorax and the trachea. The registered signals will be electronically recorded and stored. A corresponding recording can be done continuously for many hours. A fully automatic analysis evaluates the recording and provides different display options and a report.