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The BG-E3 is a battery grip for the EOS DIGITAL REBEL XTi/XT, EOS 400D/350D DIGITAL that can hold two NB-2LH or six AA size batteries.
It is also equipped with a vertical-grip shutter button, dial, AE lock/FE lock button, and AF point selector button to enable shooting in the same fashion as a horizontal grip.
--Hand Strap E-1 (optional) can be used for enabling a more secure grip.