Canon 2313B001 Battery Grip for Eos 40D Digital Camera

Features: Main dial. AE lock/FE lock. Adds a vertical shutter release. 1/4-20 size tripod mount thread. Provides additional shutter release. AF point selection controls for easier vertical shooting. Compatible with up to two BP-511, 511A, 512, 514 Lithium-ion battery packs, or six AA batteries with included battery holder BGM-E2.