This adapter provides a male, 6-pin, Firewire 400 connection on one side and a female, 4-pin connection on the other end. This allows you to use a 4-pin (iLink) M/M Firewire 400 cable to connect between your Firewire 400 equipped computer with 6-pin connector (such as older Macs and PCs with a firewire card) and your 4-pin equipped device (e.g., camera).