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The Phottix Battery Grip BG-550D (BG-E8) Premium Series Vertical Grip/Battery Holder is for Canon EOS 550D / Rebel T2i / 600D / T3i digital cameras. This battery grip can hold two batteries LP-E8 or six size-AA batteries. It is also equipped with a vertical-grip shutter button, Main Dial, AE lock/FE lock and AF point selection controls for easier vertical shooting. Also has Tripod Socket.