... lens. Wireless sweep: frequency detection range(1-6.5MGHZ) Help:A: DETECTION CAMERASOpen the power switch ,power indicator light ... (wireless camera/listening devices, etc.)Sound detection:turn the power switch to the middle position, the power indicator light ... radio signal.Detect more subtle 5.8Ghz wireless camera videotaping, wireless eavesdropping, wireless monitor signal.Check the hotel ,toilets, ...