Getting that perfectly focused shot is a piece of cake with this bluetooth shutter controller. No more last second wobble as you press the button on your camera. No more missed shot because the object you are photographing moves before the self timer triggers the shutter. I didn't really think I would use the battery pack much, but I always seem to find something to photograph when my battery is low, and the battery pack saves the day! The battery pack also comes in handy for charging my phone while in the back country, so I can check in with family during my solo hunts.