... vibration (silent) 3 beep detection probe detection 4.LED display 5. Headphone mute detection5) low-voltage prompts ... light switch, back of the instrument six LED flashes3. Down and move around the instrument, laser scanning ... audio cues)4. If you hold down a row switch, LED flashes every 2 seconds, a fast ... are transmitters. Signal becomes stronger, the 4 LED lights at the same time, the sound becomes ...