DXi4800 is customer installable. Order this item for professional onsite installation, order one for each base system being installed. Site survey is required. Includes Initial installation of any expansion modules and adapters ordered with the system. If onsite installation is selected or required, one Entry-Level/Midrange Site Charge (SAABB-NSSC-000x) must be ordered per site, per visit. The single Entry-Level/Midrange Site Charge will apply to ALL Entry-Level/Midrange products (for which installation has been purchased) being installed during the same onsite visit. If multiple onsite visits are required, order one Entry-Level/Midrange Site Charge per visit.