B71 is a Bomb jammer designed specifically for mobile phone signals and VHF UHF radio frequencies, equipped with 3 additional channels, reserved exclusively for 315-433-868MHz.
This choice, as well as the need to insist on VHF UHF radio frequencies, is due to the fact that the latter frequencies are used to triggering bombs. That’s why it’s thought it best to add 3 more channels, such as 315-433-868MHz. In addition to radio frequencies, B71 blocks mobile phone signals, up to 3G frequencies, as well.
Therefore, B71 prevents also potential terrorists from communicating with each other, using the above-stated frequencies.