Features: 1)SUPPORTS HIGH-SPPEED SYNC FLASH YN500EX is the first speedlite supports high-speed flash in china; with high-speed sync (FP flash), the YN500EX can synchronize with all shutter speeds, the maximum shutter sync up to 1/8000. 2)COMPATIBLE WITH N's and C's WIRELESS FLASHING SYSTEM One YN500EX is able to respectively accept internal flashing of 580EX II, SB-900/800/700, 7D/60D/600D, C order of N's internal flashing and ST-E2 wireless signal, achieves external TTL and manual flashing. Some beckoning functions such as wireless TTL flashing, grouping light ratio TTL flashing and the illumination of remote controlled flashing can be easily attained only if you carry a camera with built-in flashing command system and YN500EX. 3)A NEW TTL FLASH WITH LARGE GUIDE NUMBER GN53@ ISO100, 105mm; which reaches the level of the mainstream hot shoe flashes, supports HSS, TTL/M/Multi mode. 4)MULTIPLE TRIGGER MODE SUPPORTED The YN500EX can be triggered by the camera set-top, built-in or main-controlled flashing command, S1 and S2 (pre-flash-canceled mode). 5)SUPPORTS AUTO/MANUAL ZOOMING The covered focal length will vary among auto, 24~105mm on the lamp adapter by operating the zoom button on the flash light, supports full-frame/half-frame camera. 6)COMPREHENSIVELY SUPPORTS TTL FUNCTIONS The YN500EX supports HSS, FEC, FEB, Rear-curtain sync, FE lock, Modeling Light, Canon camera menu accessible 7)SUPER SPEED OF CHARGING RECYCLE The time for full gloss output current-return will only take you 3 seconds; you can get fast current-return experience even without brand-new batteries, which will only take you 4~5 seconds. 8)COMPLETED WITH STANDARD PC SYNCHRONOUS INTERFACE It makes things easier on lightening the flashlight synchronously by using PC synchronous line. 9)SOUND PROMPTING SYSTEM When the sound prompting system is enabled, the different sound ways will prompt the different working conditions of the flashlight so as to make you focus on shooting only. 10)DEPTH-OF-FIRED Press down the camera's depth-of-fired preview button, the YN500EX will send out continuous flash lasting one second. 11)ADVANCED SETTINGS ON FLASH The YN500EX has advanced options setting function, where you can self-define the functions of the flashlight on your own requirements. 12)AUTOMATIC SETTINGS SAVING YN500EX automatically save the operation currently used for your future use. 13)LCD PANEL USER INTERFACE WITH SUPER GELIVABLE METAL HOT-SHOE STAND