 Bolos are also described as having reactive armor ( to stop penetrator missiles that could bore through their regular armor), and energy battlescreens; battlescreens convert an enemy weapon fire into energy which could then be redirected to the Bolo's own systems and weapons.Also, beginning with the Mark XXIII, internal disruptor fields were added to limit damage to vital systems from any attacks which did manage to penetrate the Bolo's outer defenses.Each unit is also equipped with passive and active sensors, as well as stealth and ECW capabilities.