PRO SERIES Battery Grip for Canon SLR Cameras - Holds BP-511 and AA Rechargeables. This Professional Series Battery Grip is equipped and designed with TWO Quick-Loading Battery Magazines. Convenient for quickly switching out and loading extra BP-511's or AA Rechargeables. Maximize your shooting time for the ULTIMATE CONVENIENCE. Versatile and Comfortable Vertical Grip - Shoot from ANY Angle! This Model is designed with a Vertical Rubber Grip to make shooting Comfortable and Convenient. Various Additional Control Features for Vertical Shooting: Vertical On / Off Switch, Vertical AE Lock / FE Lock, Index / Reduce Button, Vertical AF Point Selector / Enlarge Button, Vertical Aperture Value / Exposure Compensation Button, Vertical Shutter Button, Tripod Socket, Vertical Main Dial. Manufactured at the Highest Quality - Professional Series Battery Grips are made from the SAME Mold as the OEM BG-E2N Canon Battery Grips. The Construction of the Body consists of High-Grade Composite Metal and High Quality Rubber for a Heavy-Duty Feel and Long Lasting Design. Don't buy cheap plastic knock-offs which feel flimsy and are incredibly light-weight. Purchase only QUALITY DESIGN, backed by a 1 Year Warranty. Compatible with: Canon EOS 20D, 30D, 40D, and 50D