This PL-160 Dual Flash from Polaroid has full Nikon i-TTL dedication, plus a continuous video light with three 1W LEDs, making this a terrific light if you're shooting still photos and video, since you don't need to switch back and forth between flash and continuous light. The flash has a guide number of 148' at ISO 100 and 85mm, vari-power settings of 1/1, 1/2, 1/4, 1/8 and 1/16, and built-in diffuser and reflective panels. The flash head tilts and swivels and features an auto zoom function that sets the flash zoom for the focal length of the lens from 24-85 mm. Recycling time is between 0.5 and 8 seconds, depending on the power setting. An auto sleep mode means less charging time and more shooting time and the unit has both 1st and 2nd curtain sync modes. The Dual Flash operates on 4 AA batteries.