It is just an extension cable, no converter inside!!!
DB15 female to DB15 male extender
DB15 male to female extension cable
DB15 parallel cable
Pinout: 1-1, 2-2, 3-3, 4-4, 5-5, 6-6, ... 15-15
Length: Standard is 1.5m
PE bag for each
DB15 15 Pin Serial Extension Cable Male to Female 5FT Parallel Cable-B0757F68D4