Typically, jammers merely drown out existing wireless signals with noise to interfere with them. A Signal Jammer can prevent surrounding receivers from trying to listen on a certain frequency range by adjusting it to that range and then blasting out powerful noise, tones, or pulses. In the past, this meant interfering with radio communications, but the same basic idea holds true for other wireless signals, such as cellular, WiFi, Bluetooth, GPS, and so on. A tiny portable jammer could be functional within 100 meters or less in an urban setting, while big military-grade jammer emplacements might easily reach hundreds of miles across the open country. Jammer range varies greatly depending on the strength and size of the device.
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