The Electronic Stethoscope (for time based devices) is designed for the EOD field where it is necessary to detect mechanical clockworks fuses in objects suspected to contain explosives, also where weak sound waves have to be detected. Ni-Cd Maintenance free battery. Electronic Stethoscope is of a very sturdy design fitted with splash water protection. The electronic casing user friendly. The headphones are of military design and equipped with well-Paddedear pieces to suppress ambient noise. It detects Electronics Fuses, Electronics circuits, quartz , mechanical watches, and cell Phones .This system works on high frequency and penetrates solid material like small bricks work, paper, plastic wood and similar dielectric packing material.