YN90-4G: Power charge via solarpanel Power stock via built in 18650 Li-ion Battery No need wiring,no need punching,100% wireless Plug&play,simple operation,easy installation 3 main strong tech:Microwave motion detection+Build in smart power management+built in Microwave motion detection technology:Actively detection in 0.6S,Fast, longer and wider range detection,Not affected by environment,temperature and reflect light. CAM available for any areas ineed cctvbut without power and ethernet. YN90-WIFI: Power charge via solarpanel Power stock via built in 18650 Li-ion Battery No need wiring,no need punching,100% wireless Plug&play,simple operation,easy installation 3 main strong tech:Microwave motion detection+Build in smart power management+built in decode. Microwave motion detection technology:Actively detection in 0.6S,Fast,longer and wider range detection,Not affected by environment,temperature and reflect light. CAM available for any areas ineed cctv but without power and ethernet.