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
High resolution Dot-Matrix LCD, Backlight for LCD/keys
Fast lock mechanism
Built-in AF assist beam emitter, buzzer
Remote shutter release, Linked Shot
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