Features:This battery grip/holder is compatible for Sony SLT-A77V / SLT-A77 A77II camera.Features shutter release button, main dial, AE lock and AF point selection button for easier vertical shooting.It help photographing in a vertical position much easier and provides a better handling of your camera especially when you are using heavy lenses.The battery compartment holds one or two NP-FM500H lithium battery.(battery not included)Has a tripod socket.