The latest in our line of RF detectors is tucked away inside a fully functional pen, now available in black. Lightweight and ultra-portable this device can help you detected RF signals including those emitted by cell phones in up to a 10m range. Upon detecting a cell phone or wireless signal, the red LED within the top of the pen will begin to flash, alerting you that you may be being watched. Perfect for people on the go. Don’t leave home without this RF detector.