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1 Detect foreign body button（wooden batten）
2. On and off buttons of detection function (Short press the key to turn on and shut down in the detection mode).
3 Detect metal and ac buttons
4.Ranging laser through hole
5 Ranging function menu up a scroll button
6. Start/measure/menu confirm button of laser ranging function (Short press the button to turn on, measure and confirm the menu).
7 Exit/shutdown key of laser ranging function (Short press the key to clear data/exit the current ranging interface, and long press to shut down)
8 Ranging function menu next scroll key
9 Micro USB charging port
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