YONYNUO YN-E3-RT II On-Camera Flash Speedlite Transmitter Flash Trigger Compatible for ST-E3-RT/600EX-RT/YN-E3-RT/YN968EX-RT/YN600EX-RTII/YN686EX-RT/YNE3-RX

Features:
The YONYNUO speedlite transmitter YN-E3-RT II is a transmitter for wireless flash shooting. It can control up to 5 groups(15 units) of speedlites that have a wireless multiple flash shooting function using ratio transmission.
Flash Modes: ETTL/M/Multi/GR4/ flash modes. supports 1st curtain, 2nd curtain(Only in M mode), high speed sync.
New designed select dial and display interface for easier operation, supports remote control to set the focal length(ZOOM) of the slave flash.
Firmware can be updated via USB(Micro USB), Built-in AF assist beam emitter, transmission range is 100m.
Two-way 2.4G radio communication, fully compatible for ST-E3-RT/600EX-RT/YN-E3-RT/YN968EX-RT/YN600EX-RT(II)/YN686EX-RT/YNE3-RX.