DigiPower PGR-NKD31 Power Grip for Nikon D3100 (Black) Power your Nikon D3100 D-SLR camera with two Digipower BP-NKL14 or Nikon EN-EL14 Li-ion batteries BATTERY grip design improves stability when capturing vertical scenes Designed to double shooting time Built in vertical shutter release & camera controls | Extend shooting session Includes Infrared Remote & Signal Transfer Cable