This device is an electronic amulet, tied to a necklace. It may be activated once, and the charge lasts for one use only.
The personal shield absorbs the damage of up to three attacks. If an attack causes no damage, it doesn't count towards the three uses of the shield. The damage is counted after evasion and protection rolls.
The personal shield can only be charged in the N.E.X.U.S. HQ.