This is a MeiKe Multi-Power Battery Grip for Canon 550D. It provides comfortable vertical grip with an additional shutter release and scroll wheel for easy access to the camera functions when shooting in the vertical orientation.This Battery Grip is also equipped with a vertical-grip shutter button, dial, AE lock/FE lock button, and AF point selection button to enable shooting in the same way as a horizontal grip. It is equipped with an independent ON/OFF switch. Switching to make the buttons and dials function in the same way as those on the camera. this Battery Holder has a battery compartment cover slot, a hand strap guide pin, and a 1/4" thread for being used to tripods. Please turn the camera off before attaching the Battery Holder to it or detaching the Battery Holder from it in order to avoiding damages to the camera. With this Battery Grip, your camera will become stronger. This will make you have a good time in many occasions. Also your cameral will have a very good companion. If you can buy this product and send it to your friends, he or she will become happier when she or he gets this precious gift anytime! At the same time the price is also reasonable!Don't hesitate to choose this product for your camera. It is worthy!