Just replace a wire system with 8 cameras 
Was easy to set up and running.
Only purchase 5 there is not need for more , since you can move them 360 .great view,easy to navigate you can see the whole house around. I finally took all those wires off from my old system. Guys go wifi just make sure you have good internet plan , I read the reviews about slowing down your streaming, that’s not true because I have over 1000 mbps speed and my cameras run beautiful .