Cell Phone Jammer is aimed at banning the use of cell phones in some places like exam hall, schools, oil station, church, court, library, meeting room, theater, hospitals, government, etc where cell phones are not allowed to use.

As the research shows, Cell Phone Jammer in markets now can limit the cell phone signals from 500 meters. The radius of the Cell Phone Jammer jamming is farther than 20 meters.

best cell phone jammer

When the cell phone is working, the Cell Phone Jammercan use the same frequency to jam the signals of the Cell Phone so that the Cell Phone cannot receive the signals, thus the Cell Phone Jammer would achieve its effects of jamming the signals.

When Cell Phone Jammer is in function, the Cell Phone would appear to be out of signal service, in the state of searching for signals, something like that.
You can always find effective Cell Phone Jammer in cellphonejammersales website.