The Zeikos battery grip does provide the controls needed to shoot vertical. It also provides the camera's power while the battery it contains is charged. However, once the grip battery dies, you're dead in the water. Despite the fact that my Nikon D300 menu options are correctly set, the grip does not allow the camera's internal battery to take over. When the grip battery dies, the camera shuts down. At that point you either change/charge the battery in the grip OR remove the grip and use the battery in the camera. Either way, the grip has become, basically, an expensive and inconvenient extra battery holder. I can keep an extra battery in my bag for a lot less money and swap it in my camera with a lot less hassle. I wrote to Zeikos customer service for a fix I was told they couldn't help me - I needed to read my camera manual. Not a lot of help there. If you are considering this Zeikos grip, be aware that all you are buying is an adapter to shoot vertical. Even then, think about what
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you'll have to do to remove it when the battery dies (tripod adapter? camera connection cover? etc.) before you decide if it's worth it. I'll be returning mine.