Canon BG-E11 Battery Grip for 5D Mark III in very good condition with normal signs of use.

Manufacturer's blurb

Extend your shooting time when travelling or shooting on location by using two batteries with your compatible DSLR.

Fitting the LP-E6 battery, this battery grip offers duplicate controls, such as shutter release or AF point selection, working in both landscape and portrait orientation for intuitive control of your camera.