The Yongnuo i-TTL Transceiver YN622N II for Nikon Cameras 2-Pack is comprised of two 7-channel transceivers that work on the 2.4GHz frequency. The units have 3 working modes, I-TTL (II), Manual, and Multi, and have a 300′ wireless range. The triggers supports FEC, FEB, FEL, 1st and 2nd Curtain Sync, Modeling flash, i-TTL II Group Ratio (ALL/A:B/A:B C), Manual/Multi group (ALL/ A:B/ A:B:C), Manual and Multi mode, Auto Zooming, Manual Zooming, and AF Lamp. The YN622N II transceivers will also support HSS (High-Speed Sync) for action freezing and greater exposure latitude. (Please see below for compatible cameras and flashes)