The Vivitar Power Grip holds 1 or 2 NP-FW50 batteries, providing twice the power. It also includes a wireless remote that allows you to take pictures within 20 feet. The Power Grip provides a vertica I shutter release button. This option makes shooting with the camera in a vertical position just as comfortable as shotting horizontally. The Power Grip attaches through the tripod mount on the bottom of the camera.