DSTE Pro IR Remote MB-D12 Vertical Battery Grip + EN-EL18A for Nikon D800 D810 D800E D800S D810A SLR Digital Camera A firm, comfortable grip for vertical-position shooting with the Camera. Buttons and controls are conveniently placed and easy to reach for greater comfort. Holds one Li-ion batteries or eight AA Battery for extended shooting Li-ion Battery Info: DC 11.1V;43.3Wh/3900mAh When using two batteries, the grip will automatically switch to the second battery if the first becomes depleted. Switching does not interrupt camera operation. Built in Infrared remote control function and remaining power indicator