YONGNUO YN-E3-RT Flash Speedlite Transmitter for Canon 600EX-RT as ST-E3-RT

This item YN-E3-RT Speedlite Transmitter is directly compatible with the Canon 600EX-RT flash, and a coming YongNuo YN-600EX-RT flash unit. Which includes all the features of the Canon ST-E3-RT,as well as extra features including as below - AF Focus Assist light - USB port for firmware updates - Second curtain sync (in manual only) - Full GR Group Mode functionality has also now been added for pre 2012 model cameras - Slave flash charge status does not stop other flashes from firing YN-E3-RT features: -Two-way 2.4G radio communication, fully compatible with Canon ST-E3-RT/600EX-RT -Control up to 5 groups (15 units) of Speedlites -15 Physical Channels, 1 Auto Channel, Up to 10,000 customizable photographer ID -Transmission Range: 100M -Multi YN-E3-RT can share slave flashes -Display group/charge status of slave flashes -Firmware can be upgraded via USB ( You need to buy extra USB Cable ) -High resolution Dot-Matrix LCD, Backlight for LCD/keys -Fast lock mechanism -Built-in AF assist beam emitter, buzzer -Remote shutter release, Linked Shot ( (Need extra shutter cable for cameras released before 2012) -Flash Mode: ETTL/M/Multi/GR 4 flash modes -A/B/C/D/E 5 groups -Supports 1st Curtain, 2nd Curtain (Only in M mode), High speed Sync -Supports ETTL Ratio, Flash Exposure Compensation,Flash Exposure Lock, Flash Exposure Bracket, Modeling Flash -9 Custom Functions -Settings saved automatically -Dust and water resistance equivalent to EOS-1D series cameras Suit for: ALL Canon DSLR Camera with E-TTL II / E-TTL autoflash Canon 600EX-RT Canon ST-E3-RT Yongnuo YN-600EX-RT Package Includes: 1 x YN-E3-RT 2 x Shutter release cable for Canon camera 1 x Manual in English and Chinese 1 x Protect bag 1 x Original box