Unlike analog cameras, IP cameras can plug directly into your computer or DVR. They use an IP address to transmit video through a network using Ethernet/CAT5 cable. Because IP cameras can connect to any computer, DVR or existing network little to no additonal hardware is required, reducing your system cost. All of the IP cameras include set-up and viewing software. Included IP camera software will support up to 16 cameras. Because IP cameras can connect into a network you can login remotely and view or playback video. You can also set-up email to notify you of motion. Power adaptor included with all IP cameras.