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In modern times, with the development of high technology, more and more spy devices emerged as marsh, which is a large threaten to confidential occasions.

Target at the special needs of safe and classified small places like confidential office, destine, running vehicles, guard sites of political and business circles, etc of both home and abroad market, Umibuy.com launches some high tech powerful portable cellphone signal jammers

This great Mobile Signal Detective Jammer can block the mobile signals of GSM/ CDMA/ DSC/ PHS/ PCS/3G (enhanced can shield GPS signal) in a radius scope of 0.1-15 meters (Usually 5-80 square meters). In the block area, cell phone can not take call and receive, but won't interfere the normal working of other electronic devices. If the cell phone is far away from the jammer, it can recover to normal use.

Below will recommend people several hot selling of mobile phone jammers on www.sma818.com

Top1: Power Adjustable Cellphone Jammer supports 4 signal bandwidths: GPS, CDMA, GSM, DCS. Its typical Coverage is about effective radius 2 ~ 10m. It is also built in rechargeable li-ion battery. Very convenient to carry and use. But users need to note that the antenna must be installed before powering on, or it will easily burn the panels. (24.55-21.55USD)

Top2: GPS Jammer uses in car and its coverage is 3 to 6 meters. It supports working band: L1 system 1450 to 1600 MHz. Its antenna impedance is 50W. It is a good partner for driving. And the price is very cheap. (20.33-22.33USD)

Top3: This portable GPS + cell phone signal jammer can keep you from being tracked by GPS and Signal Detection Management Systems. It is also good for schools, churches, conference rooms, hospitals and any other place that cell phones may be cause a distraction or interference. It comes with a built-in rechargeable Li-battery for 2-3 hours of signal jamming. This jammer is designed to block all GPS, GSM, CDMA, DCS system signals. (26.09-29.09USD)

Top4:Broad Spectrum Cell Phone Jammer comes with complete spectrum interference and wide range of up to 10m distance. It comes with a built-in rechargeable Li-battery for 2-3 hours signal jamming. This jammer product can block all GSM, CDMA, DCS, PHS, 3G system signals. With this jammer, you can easily keep your meeting room and your immediate surroundings annoyance free! (25.88-28.88USD) these portable cell phone jammers are easy to install and operate device is great for any place needing to restrict signal interference and limit distractions. Perfect for use in a meeting room, conference room, museum, gallery, theatre, concert hall, church, temple, restaurant, classroom, training center, factory, bank, train, bus, etc. They are powerful to eliminate most cell phone and GPS signals. They are really the real green environmental protection handheld jammer.