Compatible with Nikon TTL cameras. - Flash index: 14. Effective distance: 20cm~5m. Color temperature: 5500K. Flash coverage: 80° in either direction. Firing configuration: two flash tubes can be fired together or singly. Flash ration control: 1:8~1:1~8:1 in 1/2 stops increments. Flash exposure compensation: manual FBE: in 1/3-stop increments. Flash exposure confirmation: flash exposure confirmation lamp on. - Focusing lamp coverage: about 40° top and bottom and 45° left and right. On time: about 20 second. Recycling time: about 0.1~5 sec. Supply battery: 4 x AA batteries. Battery life: about 100~800 flashes. Max Sync Speed: 1/200~1/250 sec.