System came with 2 wireless cameras. I plugged them into power and then connected the receiver to the router using supplied cables. Plugged the power to the receiver and video showed up on the monitor. It automatically paired up the cameras. I was impressed. Turned the receiver on and off again per instructions and I was connected to the internet. Downloaded the app and I could see the cameras, as it automatically found my receiver. Used the app away from my home network and it worked fine. Back to Harbor Freight for two more cameras to make the maximum of 4 wireless cameras. To add the third and fourth cameras, I had to go to the menu option to pair them to the receiver. Selected pair and push the pair button on the back of the camera after a message to do so appeared on the screen, and presto I could see 4 cameras on the monitor. Did not come with a memory card, so to Walmart I went. Installing the SD card allows recording of a camera. Set up to record when motion was detected on the cameras. Works perfectly. I can also access the recordings from my IPhone. Was built by RDI Technologies in China, so support may be limited. However, Harbor Freight does sell extended warranties if you need extra peace of mind.