Specification 

• YONGNUO Updated YN600EX-RT II Wireless Flash Speedlite with Optical Master and
  TTL HSS for Canon AS Canon 600EX-RT w/ EACHSHOT Diffuser
• Updated version from YN600EX-RT.
• Multiple Trigger Mode Supported.
  The YN600EX-RT II can be triggered by the camera set-top,
  PC synchronous trigger, wireless optical/radio remote trigger.
• Ultrafast Charging Recycle System, Supports External Power Supply.
  It just take 2 seconds at full output. Even if not use the brand new batteries,
  it just takes 3~4 seconds ultra-fast time to recycle; Besides,
  you can also use the external power supply to meet your higher requirement.
• Supports Firmware Upgrade. The YN600EX-RT II equipped with USB interface,
  supports firmware upgrade, you can download the upgrade firmware
  through the Yongnuo official website to upgrade the flash.
• Settings Save Automatically, Supports Custom Settings (Fn)
• Compatible with Canon:
  1), Hot shoe TTL mode: Canon 1Dx, 1Ds series, 1D series, 5DIV 5DIII,
  5DII, 5D, 7D, 7DII, 80D, 70D, 60D, 50D, 40D, 30D, 20D,750D,700D,
  650D/T4i, 600D/T3i, 550D/T2i, 500D/T1i, 450D/Xsi, 400D/Xti, 350D,
  100D, 1100D, 1000D, 1200D
  2), Wirelss TTL Slave mode: Canon 5DIII 7D 60D 700D 650D 600D,
  Yongnuo ST-E2, Canon 580EX II
  3), Master Mode, It can trigger these flash:YONGNUO:
  YN600EX-RT YN685C YN568EX II, YN568EX, YN565EX, YN500EX,
  YN560EX, YN510EX Canon: 600EX-RT, 580EX II, 580EX, 430EX II