... ,Booking Rooms,Cell Monitoring etc.. S.Tradio audio surveillance kit for law enforcement, such as:Police Interview Rooms,Holding ... (imbalance)Signal Output Extent 2.5Vpp/-25dbMicrophone Electret condenserSpecial Circuit DSP de-noise, AGC circuitProtect Circuit Over-loading protection, Lightning ... PVCSize 103mm × 50mmWeight 50gStandard CE S.TRADIO audio surveillance kit specialized in Law enforcement