Do you worry about the safety of your home or your little children and old parents when you are busy in working? OK, if you are puzzled by these problems, you should pay attention to this wireless camera security system. 4 channel network stand-alone digital video rcorder, MPEG4 video compression, Linux operation system, for PC-link playback and backup / USB 2.0, SATA, one fixed HDD rack, supports up to 750GB HDD, audio recording available and 4PCS newest 1/4 inch Sharp chip, built-in 6mm lens, 420 TV line, 36 LED infrared day and night, dustproof, security CCTV wired CCD color camera, has small volume, lightweight, high integrative level, Wireless Camera Security System is easy and convenient to fix and use. You can see the situation of your home even when you are sitting in your office. And this wireless CCTV camera security system can be matched with mini type colorful wireless camera for hidden usages. Its signal can penetrate wall and realize synchronization of picture and sound at the sit.