Keep your private conversations private with the Audio Jammer. This device protects your sensitive room conversations by generating a random masking sound which desensitizes any near-by microphone. This is very effective against any microphone based eavesdropping device including tape recorders, RF transmitters, hard-wired microphones (including contact type) and shotgun microphones. It also protects against microwave or laser reflection pickups.
Because the sound from the jammer varies randomly in frequency and amplitude, it cannot be easily filtered and the only sound the eavesdropper will hear is the jammer noise. 

Features & Benefits:

• Case Dimensions: 4" x 2.5" x 1.5"
• 9 volt alkaline battery (included)
• One unit will protect up to 150 sq. ft