I have been using YI wireless cameras for the past 3 years with no issues, the cameras do need to be plugged into a 120V outlet for power. I have a second monitor connected to my desktop pc. using the YI pc app I can view my cameras 24/7, they all have two way audio, PTZ, motion and sound detection, and can send notifications to your phone.all controls can be controlled on the monitor except settings that must be used on the phone app which also lets you view the cameras 24/7. they use a 32 gb sd card to record which can be reviewed on the monitor also. the sd cards can only record about 2 days of storage and then will overwrite. you can pull the sd card and download any recording you want to save to the pc. the best part is easy setup and you can get the cameras for about $30 each.