Comelit video security kit

From website: Single-family kit consisting of Quadra series entrance panel art. 4893M and Logos series hands-free door entry monitor art. LS8731, Simplebus 2 system. The entrance panel has call buttons to expand the kit for up to 4 residences. Up to 4 door entry monitors (available to purchase separately) can be installed in each residence. Plus, the kit can be expanded with additional panels using optional accessories. The kit is supplied pre-programmed, ready to use and with all the accessories required to create the system. Suitable for installation in homes, commercial properties or offices. Reason for selling: Purchased wrong one for my own gate. Online company won’t take it back. Never even opened.