... .5m (mini 1.8m, large 2.5m) New EAS Alarm System with wide detection to 2.5m *Features TX adopts four ... and digital filtering technology, effectively isolate cluttering frequencies.AGC automatic gaining adjustment and control techniques make the installation and ... Scan rate158Hz, 168Hz, 178Hz, or 188Hz (optional)Alarm volume90db, 60db, 100db optional New EAS Alarm System with wide detection to 2.5m