PocketWizard TTL Wireless Radio System for Nikon Camera PocketWizard 2x FlexTT5 Transceiver Radio Slave for Nikon i-TTL Flash System - AC3 ZoneController for Nikon - G-Wiz Trunk - PocketWizard Warranty Transceiver: TTL Compatibility: Canon E-TTL II Transceiver: Frequency: FCC/IC: 340.00-354.00 MHz North America Transceiver: Channels: 52 Channels over 26 Frequencies (FCC/IC) Transceiver: Antenna: 2.7" / 68.58mm rubberized with 180 degree swing