The Stethophon 04 from Hermann Sewerin GmbH is a listening device for detecting and amplifying structure-born noise of all types. It provides undistorted sound reproduction, even for very low noise. In addition to a version with cable headphones, a version with wireless headphones is available. It offers sound transmission of the same quality as with a cable connection. Eliminating the cable increases working comfort significantly. The headphones and device are automatically connected by a bidirectional radio when switched on. The filter function enables users to listen to the sound at the frequency that best suits their hearing and the particular noise being listened to. The hearing protection feature automatically ensures that the headphones are muted when loud noises suddenly arise to protect the operator. To help with the leak detection, it not only indicates the noise levels acoustically, but also displays them digitally. 888/592-9916; www.sewerin.com.