1) FCC standard approved 2) Extra high sensitivity to detect pin 3) Low sensitivity mode to detect large object only 4) Reset

Operating frequency: 52kHz +/- 10% (sine wave) Sensitivity: >5cm (for a US quarter) Indication: audio alert and LED (red) alert Audio tone changes as the metal size changes Blinking green indicator when the unit is working properly Headphone jack: 1/8-inch (for silent operation) Low sensitivity: to lower sensitivity, used in place with interference LED indicators on both front and back faces are optional Low battery indication One 9V battery required   

Factory Use High Sensitivity Handheld Metal Detector