Alpha/Beta Wave, or ABW, Filters are Promethean Technology used to block out Aug abilities like telepathy, empath control, and other mind-penetrating abilities. It is primarily produced by Sky Industries.

It works by creating a barrier that scrambles all outside Alpha or Beta brainwaves while keeping the wearer's brain function stable. The technology is shaky, however, and can be overridden by a powerful enough Aug.

San Maria's SCU has ABW Filter technology. It is also rumored that The Black Guard wears advanced ABW Filters far beyond that in the private sector.