Features: High-speed Synchronous The max. sync speed is 1/8000s, but some camera is just 1/4000s, and for those cameras and flashes who don't suport HSS, the sync. speed is just 1/250s or less, different cameras have different Sync speed. -- Supporting Canon and Nik0n Wireless TTL Slave Mode a) It can receive wireless signal from Canon system as well as Nik0n system at the same time. b) It can just only receive wireless signal from Canon system, avoiding Nik0n System c) It can just only receive wireless signal from Nik0n system, avoiding Canon System Under the wireless TTL slave mode ( Off camera ), YN-568 II can be fired by Canon 580EX II, Nik0n SB-900, SB-800, SB-700 and Canon 7D, 60D, 600D with built-in commander mode, Nik0n Camera with C-commander and ST-E2 Note: Any flash exposure compensation, FEB, FE lock, manaul flash, and stroboscopic flash setting which be set with the master unit will be automatically transmitted to YN-568EXII. -- E-TTL Flash with very powerful guide number GN58 @ ISO100, 105mm, support High-speed Synchronous, E-TTL, M, Multi mode -- Being fired via multiple ways via master flash on camera, camera with built-in commander mode,optical S1 and S2 -- Auto and manual zoom functions Has a 24-105mm focal length, supports full-frame / half-frame camera -- Full support TTL Functions FEC, FEB, Rear-curtain sync, FE lock, Modeling Light, Menu Access of Canon camera -- Advanced Features a) PC Port ( You can buy 2.5mm PC Sync Cable to fit for it ) b) Sound Prompt System --- Different sound stands for different working status,it's more convenient for you to operate. -- Modeling Light Function Under the function of depth-of fired preview in Camera, YN-568 II will provide one more second continuous light. -- Advanced Setting and Automatic Saving Setting, Overheating Protection. -- Wireless Sensor -- LED Display and Metal version Hot shoe. Suitable Camera in E-TTL function: Canon 1Ds series,1D series, 5D, 5DII, 7D, 20D, 30D, 40D, 50D, 60D,350D, 400D/XTi,450D/XSi, 500D/T1i, 550D/T2i, 600D/T3i, 1000D, 1100D Package Includes: 1 x Flash speedlite YN-568EX III 1 x Protection Bag 1 x Mini Stand 1 x Manual