A cool gadget: P13 Compact cell phone Jammer
P13 Compact GSM/CDMA/DCS/PHS/3G Cell Phone Jammer creates a temporary "dead zone" to all cell phone traffic in their immediate proximity. These sorts of cell phone jammers are mostly used by the police and military to control or disrupt communication during hostage situations and bomb threats. They are now accessible in a variety of shapes and sizes including cellular phone jammers that are same in size to a cell phone. There is an antenna to send signals in a cell phone jammer.
It has been placed within an electrical cabinet. This is a strong device and the antennas are external to provide longer range and may be tuned for individual frequencies. Smaller cell phone jammer devices are battery operated. It resembles a cell phone and uses cell phone batteries. It can be plugged into a standard outlet or wired into a vehicle's electrical system. The jammer's effect can vary widely based on factors such as proximity to towers, indoor & outdoor settings, presence of buildings and landscape, even temperature and humidity play a role. There are concerns that crudely designed jammers may disrupt the functioning of medical devices such as pacemakers. However, the best thing about this device is that it operates at low enough power output (<1W) to avoid causing any problems. This Portable Cell Phone Jammer + GPS Jammer can jam all nearby mobile phones and GPS signals up to 15 meters.
This high power professional unit is an excellent combination of both cell phone and GPS jamming. This portable unit can be easily concealed in a pocket or purse, and is ideal for meeting rooms, restaurants, examination rooms, or anywhere you want to avoid the distraction or interference of cellular calls, and it will also disable any GPS tracking devices that may be on your person or vehicle. The battery included is a 2500 mAh lithium battery. As mentioned before, the device is quite small. (4.06 x 1.77 x 0.71 in). The package includes: 1 x Cell Phone Signal Jammer, 1 x USB Cable, 1 x Antenna, 1 x Car charge, 1 x charger, 1 x AC power adaptor : input 100 ~ 250V 50/60Hz and 3 x Detachable antennas(GSM, DCS, 3G)
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Source: http://www.articlesbase.com/cell-phones-articles/a-cool-gadget-p13-compact-cell-phone-jammer-4782066.html
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