1.same as orginal function
2.with shutter
2.use 2 BP-511 li-ion and 6 AA batteries
3.CE UL RoHS.

This is a new battery grip for Canon EOS 20D 30D 40D 50D SLR camera. It holds two BP-511 batteries or 6 AA batteries or two BP-511A li-ion batteries. It double the battery capacity of your camera. Vertical shutter release button on the Battery Grip makes shooting with the camera in a vertical position much easier and add stability to the camera.