Vello BG-N8 Battery Grip for Nikon 300/300s Compatible w/ Nikon D300/300s Cameras | Fits EN-EL3e, EN-EL4, EN-EL4a Batteries | Also Works with 8 AA Batteries Comfort and Control in Vertical Position | Vertical Position Shutter Release Button | Vertical Position AF-ON Button Vertical Position Multi-selector | Vertical Position Main & Secondary Dials | Contact Cover Holder In The Box: BC-N1 Battery Chamber Cover, EN-EL3e Battery Holder, AA Battery Holder, One Year Limited Manufacturer Warranty