Technical Specifications 

Power Supply: 9V (6F22) Operating Frequency: 22 kHz 

Operating Current: ＜50 mA Operating Voltage: 7V‑9V 

Indicators: Visual – Red/Green LED; Audio – Speaker or Earphone (earphone not included) 

Controls: On/Off Switch, Low‑sensitivity Switch, Sensitivity Adjuster 

High Sensitivity: Detects a 15 mm pin, a 45 mm US 25‑cent coin 

Low Sensitivity: Responds only to large metal objects such as handguns, knives, etc.