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The Phottix BG-500D Battery Grip Premium Series Vertical Grip/Battery Holder for Canon 450D/500D (Rebel XSi) and Canon 1000D(Rebel XS), Rebel T1i digital cameras. This battery grip can hold two Battery Pack LP-E5 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.