1.Auto detect the wireless signals, when there is unknown wireless signals, the detective pen will give the color light automatically


2．Press the key when you want to check the money fake or not , don’t touch the cap of a pen at first , the blue light flashes once while the it begins to work, and please don’t release the key until the detection is ended.

3. The color light flash will be stronger and stronger when the detector is nearer to the suspicious transmit, then you can touch or hold the cap of a pen to reduce the sensitivity of the detector. until find the source of the signal

4. Change the batteries if the red light can’t be lit any more. Please screw off the battery lid and remove the old batteries , install four new LR-44 batteries matching correct (+) and (—) poles as indicated, then screw the battery lid back.