... ,Holding Cells,Booking Rooms,Cell Monitoring etc.. S.Tradio audio surveillance kit for law enforcement, such as:Police Interview Rooms,Holding Cells ... : 3 x 0.5mm2 RVVP cable, 4 core phone line, network twist line, etc.10.Built-in over-loading protection and ... 's Material PVCSize 103mm × 50mmWeight 50gStandard CE S.TRADIO audio surveillance kit specialized in Law enforcement