B.E. Meyers ' Co. offers the Homeland Defense Reconnaissance, Intelligence, Surveillance and Target Acquisition (RISTA) kit. The kit consists of specialized surveillance gear that will equip the operator with a flexible, all-inclusive set of tools that can provide digital video coverage from 25 meters out to 4 kilometers during both day and night surveillance missions. The heart of the RISTA Kit is its third-generation Dark Invader Owl Night Vision Pocket scope with the Image Guard system in its new aluminum housing. The Image Guard feature which will automatically protect the Dark Invader Owl third-generation tube by switching off the power if the unit is inadvertently turned on in day light or other brightly light situations that can cause damage to the intensifier tube.