Features: Master & Slave Wireless FlashAs a master unit, YN560 IV 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; as a wireless slave unit, fully supports YN560-TX, RF-603(I/II), RF-602 Wireless transmitter. Multiple Trigger Mode SupportedGN58 at ISO100,105mm High guide number 2.4G wireless flash, supports M/Multi mode, can be triggered by the camera set-top, 2.4G wireless trigger. S1 and S2 light are sensitive trigger, S2 with pre-flash-canceled mode. Electric Zooming & High Speed RecyclingThe flash focal length can be altered between 24-105mm by pressing [ZOOM] button; Ultrafast Charging Recycle System for better using experience. Sound Prompt FunctionWhen the sound prompt system is enabled, different sound modes will prompt different working conditions of the speedlite so as to allow you to focus on shooting process (Note: the sound can be turned off). Other Practical and Powerful FunctionsWith charging socket for external power pack, meeting your higher demand for charging recycle; The parameters on the flash will automatically save when the flash turned off; the users can customize setting the flash function as needed. Specifications: Model: YN560 IV Circuit design: Insulated Gate Bipolar Transistor (IGBT) Guide No.: 58 (ISO 100, 105mm) Flash mode: M, Multi Triggering mode: Camera set-up, S1, S2, RX, TX Zoom range: 24, 28, 35, 50, 70, 80, 105mm Vertical rotation angle: -7 to 90 degrees Horizontal rotation angle: 0 to 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 to 1/20000s Flash control: 8 levels of output control (1/128 to 1/1), 29 levels of fine tuning External interface: hot shoe, PC port and eternal charging port Wireless triggering distance: 100m(2.4G wireless); 20-25m indoor, 10-15m outdoor Additional Features: The electronic flash head zooming, sound signal, automatically saving setting, power saving mode, over heat protection and advanced options 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(English & Chinese)