The JerkStopper Camera Support from Tether Tools is designed for tethered shooting and works to provide slack to the tether cable or cord. This helps to ensure it stays plugged in to your camera, preventing damage to the cable or equipment. It can be used with any standard A/C power adapter cord, flash sync cord, HDMI, USB or FireWire cable. It supports cable diameters from 3.5mm to 8.5mm.