The CNK-IP-217 provides a high quality pass through digital video connection and has 4 blank snap-in ports that can be populated using your own snap-ins, or you can purchase a variety of snap-ins from Altinex. The CNK-IP-217 is designed to be interfaced with the CNK-IP-210 Face Plate (sold separately) and can be combined with a variety of modules from the CNK-IP modules product line (see details in the "Related Items" section). The CNK-IP product line modules can be installed into any opening in the CNK-IP-210 Face Plate.