Please check the layout of sensor board.
![Image](http://www.security-warehouse.com/images/lm240xdt_02.jpg)
To adjust the microwave sensitivity, rotate switch clockwise or anti-clockwise. most left position is 25% while most right position is 100%.
LED implication:
Stay Red - alarm alert
Stay Yellow - microwave trigger
Stay Green - infra-red trigger
Blinking Red - Power up self-test phase