For the Nikon F100. The MB-15 increases film advance from 4.5 to 5 fps no matter which batteries are used. It features an alternative shutter release button and a command dial for comfortable vertical shooting and runs on six 1.5V LR6 (AA-size alkaline) or 1.5V FR6 (AA-size lithium) batteries, or on an MN-15 Ni-MH rechargeable battery pack.