... Vibration detection 3.beep detection,led display detection 4. range:1MHz - 6.5GHz mobile phone detector Introduction:This product uses the ... )laser detection, 2)Vibration detection,3)beep detection,4)led display detection,5)headsetLow voltage prompts, built-in rechargeable battery ... blue light)Click the laser switch, instrument back 6 led light starts blinking.Vertical and horizontal movement of the ...