Canon BGE1 Battery Grip for use with the Digital Rebel Camera

From the Manufacturer
The BG-E1 holds 2 Battery Packs BP-511 or BP-512 to offer double-length shooting time. The vertical shutter release also makes shooting with the camera in a vertical position just as comfortable as shooting horizontally.

Product Description:
Made just for the EOS Digital Rebel, the Battery Grip BG-E1 holds up to 2 Battery Packs BP-511 or BP-512 to offer double-length shooting time. The vertical shutter release makes shooting with the camera in a vertical position just as comfortable as shooting horizontally. The following functions are available in the vertical shooting position. Shutter, Main Dial, AF Point Selection, AF/FE Lock, and AV +/-. For AC driven shooting the BG-E1 is compatible with the AC Adapter Kit ACK-E2. Optional Hand strap E1 is available