If you're concerned about someone eavesdropping during your meetings or private conversations, then the Cell Phone Detector with White Noise is all you need. This device can detect and indicate the illegal activation of a mobile phone for eavesdropping control.  In addition to this function, it also creates interference to the surrounding area of the telephone's microphone by generating 'white noise' when radio-waves are detected. This noise suppresses the microphone in the telephone rendering it useless.

Features & Benefits:

• Warns you with the help of the 3 LEDs and a sound alarm when the telephone starts exchanging data with the network
• Automatic generation of audio interference (white noise)
• Accurate and sensitive detection of GSM 900/1800, CDMA850, WCDMA2100 (3G, UMTS) by Bluetooth intelligent algorithm of the microcontroller
• Separate visual and sound indication of different communication protocols
• Protable design 
• High  sensitivity for detection with pre-selectors provides a better detection distance
• Long battery resource of up to 5 days (low current consumption)
• Does not block the mobile network in the area