... (mini 1.8m, large 2.5m) New EAS Alarm System with wide detection to 2.5m *Features TX adopts four frequencies ... property), ensures high sensitivity, high detecting rate, and low false alarm rate.Advanced SMT processes, coupled with rigorous quality control, 100% aging and testing, guarantee ... (optional)Alarm volume90db, 60db, 100db optional New EAS Alarm System with wide detection to 2.5m