Features: *Supports Wireless Master Function: The YN560 IV can be used as master unit, provides 3 independent groups with controlling ability, realizing remote control the flash mode, flash output and focal length of the YN560 IV and YN560 III. *Supports Wireless Slave Function, fully supports YN560-TX, RF-603(I/II), RF-602 Wireless transmitter: One YN560 IV can respectively receive the wireless signal from YN560 IV, YN560-TX, RF-603 (I/II), RF-602 with optional 16 channels; when the YN560 IV and YN560-TX used as transmitter, it can realize remote control the parameter settings. *Multiple Trigger Synchronous Mode Supported: The YN560 IV can triggered through the set top of the camera, 2.4G wireless triggering, S1 and S2 pre flash cancel mode. *Settings Save Automatically, Supports Custom Settings (Fn): The parameters on the flash will automatically save when the flash turned off; the users can customize setting the flash function as needed. *GN58 @ ISO100, 105mm: High Guide Number 2.4G wireless speedlite, supports M/Multi/--mode. *Sound Prompting System: When the sound prompting system is enabled, the different sound ways will prompt different operating state of the flash so as to allow you focus on shooting. *Support Electric Zooming Function: The flash coverage can be altered between 24~105mm through the [ZOOM] button. *Ultrafast Charging Recycle System, Supports External Power Supply. *Equipped with Big Size LCD Display Screen, Standard PC Synchronous Interface. Specifications: Circuit design: Insulated Gate Bipolar Transistor (IGBT) Guide No.: 58 (ISO 100, 105mm) Flash mode: M, Multi Triggering mode: Camera set-up,TX, RX, S1, S2 Zoom range: 24, 28, 35, 50, 70, 80, 105mm Vertical rotation angle: -7~90 degrees Horizontal rotation angle: 0~270 degrees Power supply: 4* AA size batteries (not included) Lighting times: 100~1500 times (AA alkaline cell used) Recycle time: approx. 3s (AA alkaline cell used) Color temperature: 5600k Flash time: 1/200s~1/20000s Flash control: 8 levels of output control (1/128~1/1), 29 levels of fine tuning External interface: hot shoe, PC port and external charging port Wireless triggering distance: 20~25m indoor, 10~15m outdoor, 100m(2.4G wireless) Additional features: The electronic flash head zooming, sound prompt, PC prot, power saving mode, overheating conservation and auto save settings Item size: 20 * 7 * 5.5cm / 7.9 * 3.0 * 2.2in Item weight: 366g / 12.9oz Package size: 21 * 10 * 8.5cm / 8.3 * 3.9 * 3.3in Package weight: 541g / 1.19Lbs Package List: 1 * Speedlite 1 * Mini Stand 1 * Protecting Bag 1 * User Manual(Chinese & English)