These models are a combination of discontinued A-stock and B-stock models.
A-stock models are brand new, never used products that have been discontinued and are available at excellent prices.
B-stock units are units that have been used at tradeshows for demonstration or returned and repaired. While both discontinued A-stock and B-stock units carry full warranty, some B-stock units may have cosmetic blemishes such as scratches or dents and some units may be missing spare parts such as remotes and manuals. 
Manuals can be downloaded from the Kramer web site for all models.