™ nuclear radiation detector monitor (keychain attachable) alarmProduct ReviewP Click on the link for more reviewsPAlways "ON" 247, Includes long-life 10+ year batteryPDetection Range: 100 mRhr to 5,000 Rhr, Gamma and X-rays from 20 keV to above 2 MeVP2 year regular warranty, 10 year prorated warrantyPMeets DoD EMP immunity standardsPMade in the U.S.A.