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Looks just like your mobile phone, allows you to carry it anywhere without others aware: in class, in seminar, in shop, place of worship, library, on train or bus during trip, etc.
Jamming distance: Up to 15 meters radius, depending on the strength and type of cellular system
For all types of cellular system including analog (AMPS, TACS, NMT) and digital (GSM, DCS, CDMA, PDC, TDMA, PHS, PCS, iDEN)
By Glenn Fleishman
I use a Bluetooth headset for 95 percent of my talking time. Bluetooth puts out less signal strength than Wi-Fi, even.