The DigiairWatch series are D.I.Y. (do-it-yourself) economy digital wireless security systems. Our DigiairWatch series include one (DigiairWatch) or two (DigiairWatch2) weatherproof digital wireless camera(s) and a wireless receiver/recorder that records to a SD card. Compared to full version digital video recording (DVR) systems, the DigiairWatch series are much less complicated to operate, much more affordable and can be installed in minutes. Simply insert a SD card into the receiver, position and mount the camera(s), plug all the power adapters into an electrical power outlet 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.