• E-TTL Compatible,Built-in AF-Assist Beam,E-TTL Wireless Autoflash Control
• Canon Speedlite Transmitter E-2

• 550EX-dedicated, clip-on Speedlite transmitter with direct contacts
• E-TTL Compatible
• Built-in AF-Assist Beam
• Sets and Controls Flash Rations
• High-Speed FP Flash E-TTL
• Wireless Autoflash Control