has the same functions as the original Nikon grip . It can hold one EN-EL14 rechargeable battery (Note: now can not hold the AA battery) - effectively doubling your shooting capacity. This battery grip includes an alternate shutter-release button for vertical shoots and the AE-L / AF-L button, Multi selector, main dials and subcommand dials to increase its functions, used more conveniently. Camera menu options allow users to choose whether the camera battery or this battery grip first.