The Nissin Di866 Mark II Flash For Nikon DSLRs, with a Guide Number of 198 (ISO 100 in feet at 105mm), provides photographers with the power needed to light up a wide variety of shooting situations. It provides an easy-to-read, two-way color display which helps ensure intuitive operations. The Mark II has been upgraded from the previous model, with a re-designed zoom head that has a new transmission motor that significantly reduces the operating noise to a volume level of 70dB or less, a new metal foot for the hot-shoe mount, and a flash tube with increased heat tolerance. The fill-in sub-flash power ratio range has been increased, now offering a range from 1/1 to 1/128, and the high performance wireless sensors now cover the distance of 82' (25 meters). The Mark II also has auto-rotation so it stays upright even when turned for vertical framing. It features the "MY TTL" mode for adjustable default level, and a manual motor zoom of 24-105mm. It is designed with clip-on capabilities, built-in wide-angle diffuser and catch-light reflector for added versatility. It's powered by four AA batteries (not included), and when it is operated with a Nissin Power Pack Pro 300 (not included), users have 300 full-power flashes. It boasts a recycling time of 0.1-5.5 seconds. Compatible with i-TTL/i-TTL-BL.