The jammer is a device that blocks the signal by blocking the phone, GPS signal and wi-fi system's bluetooth or wireless signal. The wifi jammer overwhelms a specific area of the noise that overlaps with the radio tape. This interference wireless network can be used for many reasons, such as preventing unwanted calls from telemarketers; And people in certain places, such as restaurants, use their phones in this particular neighborhood. Law enforcement and intelligence professionals also know the use of this technology in times of crisis, such as hostage taking and bomb threats. Although there are many uses, some states prohibit the use of jammer, which should be validated before purchasing jammers.