Complete with built-in radio transmission wireless functionality, the Speedlite 600EX II-RT sits at the top of Canon's on-camera E-TTL / E-TTL II compatible flash lineup with a powerful guide number of 197' at ISO 100 and 200mm. This revision improves continuous flash performance by 1.1-1.5x, or up to 2.0x with optional battery pack, simplifies the menu system for faster operation, and includes a specially designed bounce adapter, a hard color filter, and an updated soft case. The two-way 2.4 GHz radio system provides added reliability and a range up to 98.4' among up to 5 groups with a total of 15 individual Speedlites.

This system also does not need direct line-of-site like traditional optical-based transmission and will work through obstacles. For added coverage and functionality, the flash's zoom head can reach from 20-200mm, with the option for wide 14mm coverage when the built-in diffusion panel is used.

• 2.4 GHz Wireless Radio Transmission
• Compatible with Canon E-TTL / E-TTL II
• Guide Number: 197' at ISO 100 and 200mm
• Zoom Range: 20-200mm (14mm with Panel)
• Tilts from -7 to +90°
• Rotates Left & Right 180°
• 1.1-1.5x Improved Continuous Shooting
• High-Speed, 1st & 2nd Curtain Sync
• Bounce Adapter & Hard Color Filters
• Runs on 4 AA Batteries