The DigiLCDDVR4 is a D.I.Y. (do-it-yourself) complete digital wireless security system. The DigiLCDDVR4 includes four weatherproof digital wireless cameras and a 7" LCD/SD DVR combo. Compared to full version digital video recording (DVR) systems, the DigiLCDDVR4 is much less complicated to operate, much more affordable and can be installed in minutes. Simply insert a SD card (not included) into the LCD monitor, position and mount the cameras, plug in all the power adapters and you are ready to record. In comparison to the traditional wireless technology (analog), digital wireless provides three key features which include: Increased range of transmission, secure signal and unlike analog, the digital signals are virtually interference-free from crowded wireless analog devices such as: Wi-Fi routers, Bluetooth devices, cordless phones, microwaves and cell phones.