Phottix Odin TTL Flash Trigger Includes 3 Receivers for Nikon + 8 AA Batteries And Photo4less Cleaning Cloth Wireless 2.4GHz. TTL and Manual Flash Triggering Remote power control of groups in TTL with +/- EV adjustments (3 stops in 1/3 stop increments - 18 different levels Mix TTL and Manual flash - fire some groups in TTL, others as manual Remote power control in A:B ratio modes with +/- EV adjustments High speed sync - shutter speeds up to 1/8000 sec