Firewire 6 pin to 9 pin 1394b converter.
Permits you to use your 1394a cable with Firewire 800 devices/ports.
The 6-9 pin adapter can be used on new (late 2008) Apple Macbook Pro laptops to connect legacy Firewire-400 devices on the Firewire-800 built-in port of the Macbook Pro.