... public safety device, security applications, waterside Long Range Acoustic Device - QS IILong Range Acoustic Device (LRAD) QS II is ... Ground/mechanized offense/defense operations.Principle of Operate:Long Range Acoustic Device work principle like Antenna array, ... <10% @134dB(rms)CompositionAcoustic base array ,Signal Source, Amplifier, Controller, Power Supply * LRAD, Bird Repeller, bird control ...