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Operation instruction before detecting any signals and devices, you need to turn on this detector by rotating the power switch knob clockwise, and then rotate the power switch knob clockwise to the maximum, you will hear the buzzer and see the signal Indicator stays on. After that, you need to rotate the knob counter-clockwise until the signal Indicator flashes (only one pilot lamp flashes). these are the necessary steps to initialize the detector and adjust the sensitive to detect signals or devices.