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This Laser defeater is simple to use, compact, portable, and inexpensive. The unique design interrupts, s and jams the laser mic by sending out a human voice frequency sound to drown out your conversations. It sends a constant signal that takes advantage of the notch filter in a laser mic (the filter that allows the device to isolate and amplify human voice). This effectively stops the laser mic from being able to modulate the sound of human voice; the demodulator at the other end just receives gibberish instead of your private conversations. This laser mic defeater simply attaches to the window and using 1 9 Volt battery ( included) protects you for approx 50 hours. There is an on and off switch so you can control what conversations and protected and what ones are not, and extend the battery life by only using it when needed. This item is great for use in government offices, corporate board rooms and offices, high rise buildings and for home use. Anywhere you have a window that could be vulnerable to a laser microphone, this portable personal laser microphone defeater is the answer to keep our ever disappearing privacy safe from Big Brother's prying ears. One device is needed per window. What is Laser Surveillance? Laser surveillance ( also known as a Laser Microphone Voice Detection) is an invisible laser beam that is focused on a window. The voices and sound from the room are absorbed by the window and picked up by the laser beam. The receiver at the other end detects the vibrations transmitted by the laser beam and amplifies them, allowing the user of the laser mic to listen in on many confidential conversations. Laser mics can be used as far a a mile away (line of ). The laser mic systems are expensive and are used mostly by government agencies, though there is the possibility of a private individual obtaining and using such a device.