This appears to be a military backpack, like a field radio, that has two antenna attached to the top of it. These rotate slowly when the device is operating.
The device when switched on generates a personal force field that protects the wearer from high velocity attacks, however low velocity objects (swords, knives, shuriken and cars) pass straight through. Switching on the device is a 2shot action; the GM rolls the operators Fix-it (or Jammertech) skill , the result being the number of WP's that the Bulletstopper will absorb before shutting down. If the Jammer rolls snake eyes during this time, the pack short circuits shuts down and bursts into flames.
The device uses a lot of power and can only be used once every fight .
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