Vertax E11 is a Battery Grip for Canon 5D Mark III/ 5DS/5DSR camera which can be installed with two batteries of LP-E6 or six batteries of AA/LR6. An E11 grip equals to an extra battery that can double the power. It is indispensable for shooting outside. The battery grip is equipped with shutter button in vertical position, main drive plate and other buttons that can make the operation the same whatever shooting in vertical or horizontal position. Adopted the same material of the camera body, the battery grip has the same capacity of waterproof and dust-free as the camera body with the seal treatment of each part. The quality is comparable with the one in the original factory with the super workmanship and performance.