This is a used Profoto A1 AirTTL-N Studio Light for Nikon.
The A1 was created for the professional photographer looking for portability and performance features or the ambitious non-professional who recognizes quality lighting but wants it comfortably and easily without the hassle of an overly technical interface. The A1 is easy to use. You can literally take it out of the box and start shooting. Your first shot is nearly always a keeper. The old adage about not judging a book by its cover simply doesn’t apply here. The A1 is a good-looking flash, in fact, even its packaging could compete with Apple for design. Weighing 1.2 lb including its battery, the A1’s sleek matte black finish not only appeals to the eye but to the tactile sense as well.