1.New EAS Alarm System with wide detectionto 2.5m 2.4X4 ... 5m (mini 1.8m, large 2.5m) New EAS Alarm System with wide detection to 2.5m *Features TX adopts ... detecting rate, and low false alarm rate.Advanced SMT processes, coupled with rigorous quality control, 100% aging ... rate158Hz, 168Hz, 178Hz, or 188Hz (optional)Alarm volume90db, 60db, 100db optional New EAS Alarm System with wide detection to 2.5m