Yongnuo YN-560 IV Speedlite for photography

Features 3 groups and 16 channels for wireless operation. Can receive a wireless signal from YN560-IV, YN560-TX, RF-603 (I/II), and RF-602. Metal hot shoe for standard on-camera triggering. Large LCD screen for viewing settings and making adjustments. Socket for SF-18C or SF-17C external power pack. Audible flash ready indicators offer different sounds based on flash status 100-1500 flashes from one set of batteries Automatically saves your current settings Built-in bounce card Color temperature of 5600K Eight levels of flash output from 1/1 to 1/128 with 29 individual settings Optical triggering range of 66-82' indoors or 33-49' outdoors USES AA BATTERY(NOT INCLUDED)