Phottix Odin II TTL Wireless Flash Trigger for Nikon - Transmitter Only (PH89069) Wireless 2.4GHz TTL and manual flash triggering with 32 channels and 5 groups. Also features Digital ID, which offers photographers a way to personalize their Odins and prevent triggering from other nearby triggers Mix TTL and manual flash with the ability to fire some groups in TTL and other groups in manual, while remotely controlling their power. Also features ratio flash control in TTL mode, with +/- 3 EV in 1/3 stop increments for creative and versatile lighting effects Capture images at shutter speeds of up to 1/8000 sec with High speed sync and achieve other creative effects with Overdrive Sync Capabilities Remotely control the power and zoom adjustments of the Mitros+ Compatible with Phottix Odin ,Strato II, and Atlas II Wireless Flash Triggers. Firmware upgradeable via built-in USB port