Digital Wireless 4CH Quad DVR 4 Camera IR Night Vision Outdoor CCTV Camera with 7 TFT LCD Monitor Home Security System. This is just an ideal distance because wireless cameras are affected by the environment. Dimensions: 9.5 6.9 6.9cm. The item “7 Wireless Monitor 2.4GHz 4CH CCTV DVR Kit WIFI Cameras Audio Security System” is ...