Features:
2.4G wireless radio master function and slave function， can be used as on-camera master unit and remote slave unit.
As a master unit， it can trigger the flash which mounted on SN910EX-RF transceiver.
S1 & S2 basic optic slave modes， support HSS 1/8000s.
With a auto coverage of 20-200mm.
Support on-camera E-TTL speedlite to achieve automatic flash photography.
Wireless triggering distance can reach up to 100m.
USB port to support firmware grade.

Specifications:
Guider Number: GN60.(ISO100，200mm)
Wireless Flash: Radio Transmission Slave， Optical pulse Transmission Master/Slave
Flash Mode: E-TTL/M/Muilti
Zoom Range: Auto， 20-200mm(When using wide angle dispersion plate is 14mm)
High Speed Sync: 1/8000s
Shutter Sync: High Speed Sync， Front-curtain Sync and Rear-curtain Sync
FEC: Support (with an increment of 1/3 in ±3 gear)
FEB: Support
FEL: Support
Remote power control: support
Remote zooming control: support
Backet exposure compensation: support
Modeling Flash: Support
AF assit-focus: LED focus Support
Manual Flash: 1/128~1/1(with an increment of 1/3 gear)
Frequency Flash: 1 - 100Hz
Recycle Time: Quick flash less than 2s， ordinary flash less than 3s
Radio Transmission Distance: Up to 100m
Optical Transmission Distance: Up to 20m
Radio Transmission Channel: CH.1-15
Flash Group: Support A/B/C flash group
Flash Light Ratio:8:1-1:1-1:8
External Interface: Hot-shoe， PC sync interface， external charging interface， USB upgrade interface
Battery life: Flash 100-700 times
Power supply: 4 * AA batteries (Not included.)
Item Size: 20.5 * 8 * 5cm / 8.1 * 3.1 * 2.0in
Package size: 21 * 11 * 9cm / 8.3 * 4.3 * 3.5in
Net Weight: 484g
Package weight: 704g

Package List:
1 * Speedlite
1 * Carrying Bag
1 * Mini Plate