Motor drive cords connect to the camera's remote cable socket, and enable the Pocket Wizard radio slave to trigger the camera's shutter remotely. This pre-trigger 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. However, the pre-trigger mode can be switched on or off from the cable itself. This cable is 3' long, and will trigger Nikon 2-pin cameras, eg. F4/4s and F3 series when used with MD-4 Motor Drive, FM2 with the MD-12 Motor Drive, or N70 & N8008.