... ,Monitor range:160 square metres 2,Mini sound baby monitor:0.2g,14x4.2mm 3,AV and DC jack pinhole monitor ... china factory, Mini Audio monitor with 160metres monitor range,0.2g,14x4.2mm Features1, Suitable for hidden or embedded installation ... . 4,can be widely used to various places, like bank, finance, market, prison, judicial, test room, meeting room, industrial production, military ...