The questions are for a flash and this is a controller for multiple flashes. Nissin makes some of my favorite flashes. I have an air 1 for the new Sony mount. The Sony a37 uses a mount Sony adopted for a while after purchasing Minolta. As is the case for most flash equipment, it is important to do the research and insure the mount is the correct interface for your camera. The unit allows for multiple flash units to be set at different power levels. Programming is fairly straightforward and if no instructions come with the equipment user manuals are available online.
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