Number of Cameras and Hard Drive depends on which option you selected, thanks. And 51ER Changed to T1GN on Aug, 29th, 2022. 51ES Changed to T1GL On Sep, 9th, 2022. This item is in the category “Consumer Electronics\Surveillance & Smart Home Electronics\Home Surveillance\IP & Smart Security Camera Systems”. The seller is “sannce2306″ and is located ...