This flash will attach directly to your cameras hot shoe. This flash can also flash wirelessly if triggered by a second similar flash. Flash modes: M, S1, S2, Multi. Includes Vertical bounce Range of 0° - 90° and horizontal swivel Range of 0° - 270°. Autofocus auxiliary lamp helps the camera to focus in low-light situations Includes Diffuser & Reflecting plate Guide Number, (Formula): 35 Meters, (Guide Number = Distance × f-number) Power Source: 4x 1.5V "AA" batteries (alkaline, lithium, NiCad & NiMH)