Wall listen walls have ears: very strong penetrating, doors, windows, walls, metal, wood, glass, every fire board, plastic, etc. can be easily enlarged listening, and is very easy to use.
1) For doors, windows, walls, machinery and equipment, such as spacers listening
2) high-sensitivity sonar system
3) Headphone and recording output hole, general recorder synchronized recording, the essential equipment to gather evidence
4) Built-in lithium battery, working time up to 10 hours
5) Apply to collect forensics large equipment "visceral" fault detection purposes
Specifications:
1) Consumption current: 10mA
2) Battery Voltage: 9V
3) Four sections audio choice: A segment (200Hz) B segment (800Hz) C segment (1200Hz) D segment (2000Hz)