Secure passive seal with real-time tamper indication Secure passive RF seals with tamper indication capability DSI has developed the first long-range battery-free seal with wireless interrogation and accurate localization capability Battery-freeUnlimited lifetime, environmentally safeSpecifically designed for reliable operations in harsh RF propagation environments – metallic objects, Long range, up to 30 ft., Authenticated tagsAccurate location reporting of the item or tamper with visual and audio alarmsResistant to Gamma radiation and high doses of fast neutron radiation Passive (battery-free) Seals