Shomer-Tec Laser Surveillance Defeater Interrupts, masks, and jams the laser demodulation by transmitting human voice frequencies to a window to drown out typical conversation This device was engineered to defeat "Notch" filters The Laser Surveillance Defeater is ideal for government offices, corporate facilities, high-rise buildings, even homes Developed to meet the security requirements of certain U.S. federal agencies Completely portable; it installs and un-installs on windows instantly with its integral suction component