Yongnuo YN685C Wireless ETTL Speedlite Camera Flash Unit for Canon

Features:

• GN 60m (ISO 100 / 200mm)
• HSS to 1/8000th
• Flash Mode – ETTL /M / Multi
• 1st Curtain Sync / 2nd Curtain Sync
• FEC / FEB – 1/3rd Increments (±3 stops)
• Manual Flash – 1/128 – 1/1 output control (1/3rd increments)
• 20 – 200mm Auto and Manual Flash Zoom
• Built-in Radio Slave Modes – YN-622C & RF-603 / YN-560, 2.4GHz RF Systems.
• Full Power Recycle – From 3 Seconds
• Supports Multiple Flash Groups
• Supports Multiple Channels
• Custom Functions
• Auto Save Settings
• Sound Prompt
• Heat Protection
• Large Dot Matrix LCD Screen
• Canon Like Interface
• AF Assist Light
• 360 Degree Swivel and Tilt Head
• Fast Clamping Metal Foot
• External HV Battery Port
• USB Port for Firmware Updates (?)
• PC Sync Port

YN685 Radio Slave Functions

WITH TRANSMITTTER – YN-622C / YN-622C-TX

• ETTL /M / Multi
• HSS to 1/8000th
• 1st Curtain Sync / 2nd Curtain Sync
• FEC / FEB – 1/3rd Increments (±3 stops)
• Remote Flash Power – 1/128 – 1/1 (1/3rd increments)
• Remote Flash Zoom 20-200mm – Auto and Manual
• Group Control

WITH TRANSMITTER – YN560 IV / YN560-TX

• Remote Flash Power – 1/128 – 1/1 (1/3rd increments)
• Remote Flash Zoom 20-200mm – Auto and Manual
• Group Control

WITH TRANSMITTER – RF-605

• Fire the Flash
• Group Control 

WITH TRANSMITTER – RF-603 II / RF-603

• Fire the Flash Only