Vello BG-S1 Battery Grip for Sony Alpha SLT-A77 Camera Fits Sony Alpha SLT-A77 Digital Camera | Comfort & Control in Vertical Position Vertical Position Shutter Release Button | Holds Up to Two NP-FM500H Batteries Alternate Multi-Function Controller | Numerous Secondary Control Buttons Internal Slot for Camera Battery Door | Strap Lug for Attaching Hand Strap Whats In The Box: Battery Tray, Instruction Manual, Limited 1-Year Warranty