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Canon-Compatible 2.4GHz 15-Channel Radio Compatible with Canon E-TTL / E-TTL Guide Number: 197' at ISO 100 and 200mm Zoom Range: 20-200mm (14mm with Panel) E-TTL II, E-TTL Compatible 15 Channels, 5 Groups, Range: 328' Supports USB Firmware Updates Frequency: 2405-2475 MHz units: 2