... , 2. Vibration (Mute) detection, 3. Beep detection, 4 LED display detection, 5. Headset5) Low-voltage prompts, built-in rechargeable ... )2) Click the laser switch, instrument back 6 LED light starts blinking.3) Vertical and horizontal movement of ... are emission source. Signal became stronger, the four LED light at the same time, the sound will become ... *English user Guide Mini RF Bug Detector Finder O-858