OVERVIEW: Infraded Lights Scanning Function: Push up the IR lens and briefly press the mode button, the 3 IR lights on the back will light up. Use the red filter to scan every corner of the room, when you find a reflection spot, that's the camera lens. Glad you find it! Signal Detection : In this mode, you'll hear the ""Di-"" sound when this detector find any suspicious WiFi devices around you. The blue indicator and the flashlight will blink and go out to remind you too. Adjustable Sensitivity...