RF Signal / Wireless Camera / Satellite phone detector

Auto detects the wireless signals, when there is an unknown wireless signal; the detective pen will give the color light automatically.
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. 
The color light flash will be stronger and stronger when the detector is bearers to the suspicious