Opteka Battery Pack Grip/Vertical Shutter Release for Nikon D40x, D40, D60, D3000 & D5000 Digital SLR Holds 6 AA or 2 EN-EL9 Batteries Vertical shutter release also makes shooting with the camera in a vertical position just as comfortable as shooting horizontally Increases functionality and convenience About 1840 shots if using (2) EN-EL9 type 1200mAh batteries 1 Year warranty