Main Features: -With 433MHZ wireless transmission, RT transmitter and 16 channels to triggering -1/300s-1/2000s flash duration, clear and vivid images -3 flash modes: M, S1 and S2 for improved versatility and usability. -8 variable flash output from 1/128 to full, meeting your flashlight demands. -Multiple auto-self protections for power saving and against overheating. -Added with sync socket, and a quick charge port for external power pack. -Integrated reflection board, giving a highlighted point on the eyes -Build-in wide panel diffuser, creating soft and natural illumination Technical Date: Model: TT520II Guide number: 33(m ISO 100) Flash mode: M, S1, S2 Vertical rotation angle: 0-90 degrees Horizontal rotation angle: 0-270 degrees Power: 4Xaa Batteries (Alkaline or Ni-MH are usable) Lighting times: 100-150 times (AA alkaline batteries used) Recycle time: approx. 0.1-5s (AA alkaline batteries used) Color temperature: 5600200K Wireless frequency: 433MHz Channel: 16 Workable distance: 15m Flash duration: 1/300s-1/20000s Dimensions: 190x75x55mm Net weight: 310g Compatible with: All DSLR cameras with standard hot shoe, such as Nikon, Canon, Pentax, Olympus, etc. But except for Sony and Minolta, because they use different hot shoe. Package Included: 1 x Godox TT520II Camera Flash 1 x RT Remote Transmitter 1 x Mini Stand 1 x Protection Bag