Yongnuo YN-E3-RT Flash Speedlite Transmitter for Canon 
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<br />The YONGNUO Speedlite Transmitter YN-E3-RT is a transmitter for wireless flash shooting. It can control up to 5 groups (15 units) of
<br />Speedlites that have a wireless multiple flash shooting function using radio transmission. The transmitter also has dust and water
<br />resistance equivalent to EOS-1D series cameras.
<br />Large LED screen,easy to operate.
<br />Supports USB Firmware Upgrade, can download the upgrade firmware through the Yongnuo official website to upgrade the flash.
<br />Use two international 5 batteries, cost-effective,and easy to purchase.
<br />With quick locking device. 
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<br />Features
<br />*Two-way 2.4G radio communication, fully compatible with ST-E3-RT/600EX-RT
<br />*15 Physical Channels, 1 Auto Channel, Up to 10,000 customizable photographer ID
<br />*Transmission Range:100M
<br />*Multi YN-E3-RT can share slave flashes
<br />*Display group/charge status of slave flashes
<br />*Firmware can be upgraded via USB
<br />*High resolution Dot-Matrix LCD, Backlight for LCD/keys
<br />*Fast lock mechanism
<br />*Built-in AF assist beam emitter, buzzer
<br />*Remote shutter release, Linked Shot
<br />*Flash Mode: ETTL/M/Multi/GR 4 flash modes
<br />*A/B/C/D/E 5 groups
<br />*Supports 1st Curtain, 2nd Curtain (Only in M mode),High speed Sync
<br />*Supports ETTL Ratio, Flash Exposure Compensation,
<br />*Flash Exposure Lock, Flash Exposure Bracket, Modeling Flash
<br />*9 Custom Funtions
<br />*Settings saved automatically
<br />Compatible Camera : Canon EOS Camera
<br />Compatible Flash Transmitter : Canon flash 600EX-RT Canon signal transmitterST-E3-RT