The Nissin Di700A is a versatile, full-size camera mounted flash with a zooming head, high speed sync capability, and wireless triggering compatibility. And that's immediately relevant, because this set includes a Nissin Air1 Commander transmitter, which provides full radio control over the flash for off-camera use. Compatible with Sony's ADI/P-TTL system used on all newer Sony mirrorless cameras. The interface foot on this system is the "normal," modern multi-interface foot, not the earlier inside-out foot inherited from Minolta.