Fangrui Product Details 1. Triopo Tr-666 2000mah 2.4g Wireless Dual Ttl Mode Flash Speedlite For Canon Nikon Dslr Cameras 2. For Canon Camera E-tl Auto Flash, Nikon Camera Tl Auto Flash 3. Guide Number: 60 (105 Mm Focal Length | So100, In Meters) 4. Flash Coverage: 18-180mm; Manual Zoom; Automatic Zoom (automatically Set The Flash Coverage Pattern Suitable For The Lens Focal Length And Image Size) Flash Head Rotation: Horizontal 0-270 Degrees, Up And Down -7-90 Degrees (bounce Flash) 5. Flash Duration: 1200s-120000 6. Exposure Control System: Ettl Auto Flash, Ttl Auto Flash, Manual Flash 7. Manual Flash: 8-level Light Control (11.12.14.18.116.132.164.1128) 8. Synchronization Mode: High-speed Synchronization (up To 18000s), Front Curtain Synchronization, Rear Curtain Synchronization 9. Stroboscopic Flash: Available (number Of Times: 40 Times; 199hz) 10. Manual Flash Exposure Bracketing: Adjust In 13 Gear Increments Between +-3 Gears (manual Flash Exposure Compensation And Flash Bracketing Can Be Used In Combination) 11. Wireless Function: Master Control Unit, Slave Unit, Close 12. Controllable Slave Unit Group: Optical 3 Groups: A, B, C; 2.4g 3 Groups: A, B, C 13. Channel: Optical 4 Channels: 1, 2, 3, 4; 2.4g: 16 Channels, 1-16 14. Transmission Range: Optical: Indoor 12-15 Meters, Outdoor 810 Meters; 2.4g: 50 Meters 15. Autofocus Auxiliary Light: Effective Range (approx.) Center: 0.6-10 Meters 16. Power Supply: 11.1v2000mah High-rate Lithium Battery (le-26b) 17. Recycle Time: 0.1-1.5 Seconds (power Output 1128-11) 18. Number Of Flashes: 100-1500 Times (flash Output 11-1128) 19. Energy Saving: 60 Seconds To Go To Sleep Without Operation, No Sleep State When Set As A Slave Unit 20. Synchronous Trigger Mode: Hot Shoe, 3.5mm Sync Line, Wireless Light Control S1, S2, Wireless Hot Shoe Receiver, Built-in 2.4g 21. Color Temperature: 5600k+-100k 22. Net Weight (without Battery): 410g