rf-detector-pen Spy Pen Detects Wireless and RF SignalsThe Auto detects and RF signals. The light starts blinking when it detects “signals within the ranges of 900/1200/1300 and 2400/2600/3000MHz”. The faster the blinking the closer you are to the device you’re detecting. As an added bonus it’s supposed to have some feature that helps detect counterfeit bills. The unit runs $16 and is made in . I’ve already placed my order. I have reason to believe my girlfriend bugged the house because she suspects I’m cheating. Which I am, but she’ll never catch me. The bag-lady and I only make out at the bus-stop. I don’t invite her over because she smells like urine.