Godox AD400 Pro WITSTRO 400Ws All-in-One Outdoor Flash 2.4GHz Speedlite Light 1. Model: AD400 Pro 2. Wireless Slave Unit Mode: Radio Transmission Mode (for Canon E-TTL II, Nikon i-TTL, Sony, Olympus, Panasonic and FUJIFILM) 3. Flash Mode: Wireless Off - MMulti, Slave Unit for Radio Transmission - TTLMMulti 4. Guide No. (m ISO 100): 72 (m ISO 100. With high efficiency standard reflector) 5. Flash duration: 1240 to 112820 sec 6. Power: 400WS 7. Power output: 9 gears: 1256~11 8. Strobe: Provided (up to 100 times, 100Hz) 9. Flash Exposure Compensation (FEC): Manual. February: +- 3 stops in 13 stop increments 10. Synchronization method: high-speed synchronization (up to 18000 second), front-curtain synchronization, rear-curtain synchronization 11. Delayed flash: 0.01 ~30 seconds 12. Modeling light (LED): 30W4800KTLIC: 93 13. Optical Slave Flash: S1S2 14. Display: dot matrix panel 15. Controllable slave groups: 5 (A.B.C.D.E) 16. Transmission range (approximately): 100m 17. Channel: 32 (1~32) 18. Wireless ID: In order to effectively avoid signal interference, it can only be triggered when the channel and wireless ID settings of the master and slave are the same. 19. Power supply: Lithium battery pack (21.6V2600mAh) 20. Full power flash: 390 21. Recovery time: about 0.01-0.9s 22. Power indication: Automatically shut down after about 10 minutes. 30~120 minutes idle operation 23. Synchronization trigger mode: 3.5mm synchronization line 24. Color temperature: 5600+-200K 25. Stable color temperature mode: full power range +-75K variation