TTL Flash Manual Flash Multi flash Wireless master function: C version support Canon wireless trigger N version support Nikon wireless trigger. Wireless slave unit function: Compatibility with the Canon Camera Wireless flash system realize TTL from machine manual and frequency flash. S1/S2 Light flashing mode Flash Control by Camera (only for the newest Canon Version) High Speed Sync 1/8000s Rear-curtain Sync Voice Prompt Custom function Power save mode Overheating protection Automatic save function Large size LCD display Manual Auto Zoom function Quick response: Full output recycle time only 2.9 seconds. Support High Speed Continuous Shooting: In 1/16 brightness and blew it can support 12EPS high speed continuous shooting. Suitable for all Canon cameras like Canon 1Ds Mark IV / III / II / I 1D Mark III / II N/ II / I 7D 6D 5D3 60D 50D 40D 30D 600D 550D 500D 450D 400D 350D 300D1100D1000D 650D 5D2 5D Mark III 5D3 70D 700D.