Specifications: Type: Ring Lite, twin circular flash tubes, and separate Controller Unit
Flash Control System:
Control in E-TTL Mode: FP Sync, FE lock, Flash +/- compensation, Flash Exposure Bracketing
Control in Manual Mode: Flash +/- compensation
Ratio Control in Manual: L:R tubes (A:B); 8:1 - 1:1 - 1:8 in 1/2-stop increments
Custom Functions: Twelve (in addition to any on camera), set on flash LCD; three Personal Functions
External Power Source: Compact Battery Pack CP-E4
Guide Number: 45.93' (14 m) ISO100
34.45' (10.5 m) ISO100
Recycling Time: Approximately 0.1 - 5.5 seconds
Power Source: 4 AA batteries in Controller (Alkaline, NiCd, Lithium and Ni-MH type AAs are OK)
Compatible: EOS-1Ds Mark II, 1Ds, 1D Mark II N, 1D Mark II, 1D, 5D, 30D, 20D, 10D, Digital Rebel XTi, Digital Rebel XT, Digital Rebel (For Mac/Windows; See PowerShot accessories for additional compatibility)
Spec: 1 x 4-pin Type B Male - USB Connector
1 x 4-pin Type A Male - USB Connector