The Nikon SC-17 brings full TTL Flash control of Nikon Speedlites and similar shoe-mount electronic flash units off of the camera when used with Nikon DSLRs and SLRs which have the TTL hot flash shoes.
It is 5' long and coiled.
It permits easy use of off-camera flash when mounted on a standard bracket.
Extra flashes can be fired through the built-in multi-pin contact.
$19 + $6 shipping