1. FILTER: Audio filter used to accentuate voice frequencies and remove noise.

2. MODE: Sets the unit to Search or Monitor function. Search is for performing a sweep with the audio Automatic Gain engaged, the Monitor Mode sets the Alarm Record output to detect an intrusion.

3. ALERT: Selects either audible Tone Beeper or Silent flashing LED output from monitor Mode.

4. LOW BATT: Voltage indicator, indicates approximately 10% remaining power.

5. STATUS DISPLAY: Shows unit operating conditions made by button selections.

6. GAIN: Adjusts the internal sensitivity of the Detector and Audio systems.

7. PROBE INPUT: Provides input and power for active probes and automatically selects the appropriate Probe or Aux detectors circuits.

8. PULSING SEGMENT: Indicates alarm trip point in the Monitor Mode, activates Alarm & Remote output.

9. INPUT LEVEL: Bargraph indicates signal strength of Probe or Aux inputs.

10. ALERT LED: Flashes Red when input level exceeds trip point of Monitor Mode.

11. THRESHOLD: Sets the trip point for the Monitor Mode.

12. GAIN: Controls the audio gain (volume) to the speaker or headphone output.

13. PHONES: Allows for silent headphone detection, disconnects the internal speaker.