HDStars Vertical Multi-Power Battery Grip Power Pack for Nikon D750 Digital SLR Camera (Nikon MB-D16, Replacement) Effectively double your shooting time Supports two types of batteries (one EN-EL15 Rechargeable Li-ion Battery and six R6/AA-size alkaline, Ni-MH or lithium batteries) Vertical shutter release Photographers can concentrate on shooting at their ease without worrying about battery life. The Grip incorporates controls for vertical shooting; shutter-release button, shutter-release button lock lever, AE-L/AF-L button.