Electronics

 2.4 GHz Wireless Radio Transmission
 Compatible with Canon E-TTL / E-TTL II
 Guide Number 197at ISO 100 and 200mm
 Zoom Range 20-200mm (14mm with Panel)
 Radio triggering with 30m range
 Use up to 15 units together
 Integrated optical receiver
 Remote camera triggering
 Bounce-and-swivel control with 20-200mm zoom head
 Guide number 60 (m, ISO 100, at 200mm)
 White-balance correction filters
 Fast, quiet recycling
 LCD Screen