The famous Phottix Odin TCU (Transmitter) only - perfect to control the Phottix Mitros+ TTL Transceiver Flash or to have as an extra transmitter for a second camera. The Phottix Odin TTL Trigger consists of an on-camera transmitter and control unit (TCU) and receiver units for compatible hot shoe flashes. The Odin offers photographers four wireless channels and three flash control group designations. Flashes can be controlled in TTL ratio modes A:B with EV +/- adjustments of three stops. What makes the Phottix Odin unique is the ability to designate groups in TTL/Mixed mode. Individual groups, A, B, C, can also be controlled in TTL mode with EV +/- adjustments. Groups can also be set to Manual mode, adjusting power levels remotely, or turned off. Flash head zoom can be set to be dynamically adjusted as photographers adjust their lenses. Flash zoom can also be easily adjusted manually and set statically from 24 to 105 mm. The Phottix Odin system will also trigger compatible non-TTL flashes and studio strobes.