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

Specifications:
Item type: Vertical battery grip
Compatible with: For Canon EOS 600D 550D Rebel T3i T2i
Replacement: For Canon BG-E8
Power source: 1 * LP-E8 battery and 6 * AA batteries(not included)
Material: ABS
Operating temperature: 0-40? (32-104?)
Item dimensions: 131.8 * 108 * 79.9mm/ 5.19 * 4.25 * 3.15in
Item weight: 286g/ 10.08oz
Package dimensions: 15.5 * 12.6 * 9cm/ 6.10 * 4.96 * 3.54in
Package weight: 384g/ 13.54oz

Package Contents:
1 * Battery Grip 
2 * Battery Holders 
1 * User Manual