This Paramount Nikon 4-Pin Pre-Trigger Motor Drive Cable is for Pocket Wizards or other wireless radio slaves with a 3.5mm miniphone jack and a Nikon D90 or D5000 DSLR camera. It is approximately 3' long.
This pre-trigger cable connects to the camera's remote cable socket and enables your radio slave to trigger the camera's shutter remotely. This cable is designed to keep the camera constantly awake and has the same effect as holding the camera's trigger button pressed down half-way. A camera will trigger much faster in the awake mode but will also use up more battery power. The cable is made in the USA.