Buy from Amazon.com : http://fave.co/19mWjNn <br /><br />Jenis J-C50D-P-B Professional Battery Grip for Canon 20D/30D/40D/50D (Black)<br /><br />Product Description : <br />Vertical shutter AEAF lock and AF selector <br />Vertical grip aperture control and EV compensation <br />IR receiver built-in <br />Clock timer and exposure Control <br />Uses 2 x Li or 6 x AA battery
