The Mitros+ TTL Flash and Odin Flash Trigger Combo is a versatile kit that pairs a full-size on-camera flash with a wireless transmitter able to trigger and control TTL and manual flash exposure on up to 3 groups of flash units from distances up to 328'. It is a powerful unit with E-TTL / E-TTL II functionality. The Mitros+ features a guide number of 190' at ISO 100 and a zoom range of 24 to 105mm. Besides receiving radio signals, the Mitros+ can also transmit them to other units via its built-in transmitter. The Odin TCU TTL Flash Trigger is a wireless transmitter that runs on the 2. 4 GHz frequency, has 4 channels with 3 groups and can fire the Mitros+ or other compatible flash from a distance of 328'. Flashes within each group have +/- 3 EV power compensation in TTL or user-determined power levels in manual mode. The transmitter can also remotely adjust the angle of the flash beam via its zoom button. The Odin is compatible with Odin Tx, Odin Rx, Strato II Rx, OP Tx (master), OP Rx (slave) and OP (slave) wireless systems.