The Nikon i-TTL compatible Nissin Di866 Mark II Flash, 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's "whisper quiet", a metal foot for the mount, and a flash tube with increased heat tolerance. The fill-in subflash power ratio range has been increased, now offering a range from 1/1 to 1/128, and the range of the wireless sensor has been improved.

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 (4) LR6 rechargeable batteries, (Lithium, NiMH or Oxyride--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 about 3.5 seconds.