GammaRAE II personal radiation detector serves first responders, HazMat teams, law-enforcement officers, and others who encounter radiation risks during HazMat incidents or terrorist attacks. Also ideal for security officers stationed in nuclear poweror government laboratories. Detects gamma radiation in less than sec. Alerts user to radiation by emitting audible alarm, flashing LEDs (light emitting diodes), and vibration alarm. Continuous LCD readout can be flipped for viewing by wearer or by others. Measures about 5 by 2 by 1 ins.; weighs 9 oz. Runs on 2, AA alkaline batteries, which last up to 800 hrs. Includes belt clip and wrist strap.