Features: This battery grip/holder is compatible with Canon EOS 600D 550DRebel T3i T2i DSLR cameras. It supports features such as AE lock and FE lock, and retainsaccess to the Index/Reduce button, main dial, AF-Point Selectbutton, and Aperture/Exposure Compensation Buttons. Comes with battery holders for 1 * LP-E8 battery and 6 * AAbatteries, effectively increase the camera operating time. Has a tripod socket.