Triopo TR-666 2000mAh 2.4G Wireless Dual TTL Mode Flash Speedlite for Canon Nikon DSLR Cameras 1. For Canon camera E-TL auto flash, Nikon camera TL auto flash 2. Guide number: 60 (105 mm focal length | SO100, in meters) 3. 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) 4. Flash duration: 1200s-120000 5. Exposure control system: ETTL auto flash, TTL auto flash, manual flash 6. Manual flash: 8-level light control (11.12.14.18.116.132.164.1128) 7. Synchronization mode: high-speed synchronization (up to 18000s), front curtain synchronization, rear curtain synchronization 8. Stroboscopic flash: available (number of times: 40 times; 199Hz) 9. Manual Flash Exposure Bracketing: Adjust in 13 gear increments between +-3 gears (manual flash exposure compensation and flash bracketing can be used in combination) 10. Wireless function: master control unit, slave unit, close 11. Controllable slave unit group: optical 3 groups: A, B, C; 2.4G 3 groups: A, B, C Channel: Optical 4 channels: 1, 2, 3, 4; 2.4G: 16 channels, 1-16 12. Transmission range: optical: indoor 12-15 meters, outdoor 810 meters; 2.4G: 50 meters 13. Autofocus auxiliary light: effective range (approx.) center: 0.6-10 meters 14. Power supply: 11.1V2000mAh high-rate lithium battery (LE-26B) 15. Recycle time: 0.1-1.5 seconds (power output 1128-11) 16. Number of flashes: 100-1500 times (flash output 11-1128) 17. Energy saving: 60 seconds to go to sleep without operation, no sleep state when set as a slave unit 18. Synchronous trigger mode: hot shoe, 3.5mm sync line, wireless light control S1, S2, wireless hot shoe receiver, built-in 2.4G 19. Color temperature: 5600k+-100k 20. Net weight (without battery): 410g