Features:
The set-top i-TTL flash: install it for Nikon camera to achieve automatic flash photography.
Optical signal master control function, automatic wireless remote control.(optical pulse)
Optical signal slave function: off-camera wireless high speed sync flash(optical pulse).
Auto focus auxiliary functions.
Automatic zoom function, flash zoom position can be back and forth with the change of the local length of the lens.
Support to FX/DX frame switch over.

Specifications:
Guider number: GN60 (ISO100, 200mm)
Wireless Flash: Optical pulse transmission Master/Salve
Flash mode: i-TTL, M, MULTI
Zoom range: Auto, 20~200mm (When using wide angle dispersion plate is 14mm)
High speed sync: 1/8000s
Slave flash: Optical pulse SLAVE, light trigger, S1/S2
Shutter Synchronization: High Speed Sync, Front-curtain Sync and Rear Sync
Flash exposure compensation: Support (with an increment of 1/3 gear in +/-3 gear)
Bracket exposure: Support
Flash exposure lock: Support
Modeling flash: Support
AF Assist-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
Optical transmission distance: about 20m
Optical transmission channels: 4
Flash groups: Support for A/B/C
Power supply: 4 * AA size batteries (not included)
External interface: Hot-shoe, PC synchronous interface, external charging interface
Package size: 21 * 11 * 9cm / 8.3 * 4.3 * 3.5in
Package weight: 707g / 1.56Lb

Package Includes:

• Speedlite x 1
• Protect Bag x 1
• Mini Stand x 1
• User Manual(English) x 1