Both are NAS, I-O DATA DTCP-IP compatible high-definition recording HDD 1TB HVL1-G1.0T, but the HDDs have been replaced from 1TB to 2TB on both units. Therefore, the storage capacity is double the original on both units. There is one inconspicuous scratch on one of the units. They are generally in good condition and have been tested. Please download the instruction manual from the manufacturer's website. Only the two main units are included, and there are no accessories. They will not be sold separately, and the price is set for two 2TB units. They should work if detected by MagicalFinder. The setup should be complete by going through the initial setup and then the detailed settings. No claims and no returns are requested. Thank you for viewing.