All these are wired system, not wireless. Complete system do not need Internet to work.
However, an Internet will be necessary if you wish to use mobile for remote view. Ariation listing, camera has 2/4/6/8 for option and hard drive has No HDD/1TB HDD/2TB HDD for option. Please choose the right one. The item "ZOSI 8CH H. 265 1080P DVR 2MP Outdoor Surveillance Security Camera System 1TB 2TB" is in sale since Tuesday, March 19, 2019. This item is in the category "Consumer Electronics\Surveillance & Smart Home Electronics\Home Surveillance\IP & Smart Security Camera Systems". The seller is "zosi_cctv" and is located in Walton, Kentucky.This item can be shipped to United States.