- Compatible Cameras: Canon EOS cameras (E-TTL II auto flash) 
- Guide Number (1/1 power @ 200mm): 60 (m ISO 100) / 190 (feet ISO 100) 
- Flash Coverage: 20 to 200mm (14mm with wide panel) 
- Auto zoom (Flash coverage set automatically to match the lens focal length and image size) and Manual zoom 
- Swinging/ tilting flash head (bounce flash): 0 to 360° horizontally and -7° to 90° vertically 
- Flash Duration: 1/300 to 1/20000 second 
- Flash control system: E-TTLII autoflash and manual flash 
- Wireless flash function: Master, Slave, Off 
- Controllable slave groups: 3 (A, B, and C) 
- Transmission range (approx.): Indoors: 12 to 15m / 39.4 to 49.2 ft; Outdoors: 8 to 10m / 26.2 to 32.8 ft 
- Channels: Optical: 4 (1, 2, 3 and 4); 2.4G: 32 (1-32) 
- Slave-ready indicator: Two red indicators blink 
- Modeling flash: Fired with camera's depth-of-field preview button 
- Color temperature: 5600±200k 
- Size: 64 x 76 x 190 mm