1. Compatible with all SLR cameras with standard hot shoe, suitable for Canon, Nikon, Pentax, Olympus, etc. 2. Accepts external power packs to reduce payback time and increase flash capacity 3. Output control: 1/16, 1/8, 1/4, 1/2, 1/1 4. Includes eight lens adapter rings: 49mm, 52mm, 55mm, 58mm, 62mm, 67mm, 72mm, 77mm 5. Continuous flash protection and system overheating protection 6. Lighting times: 300-1000 times (using AA alkaline batteries, not included) 7. Recycling time: about 0.1~2S (using AA alkaline batteries, not included) 8. Color temperature: 5800K+/-200K 9. Flash duration: 1/200S-1/5000S 10. Dimensions: ring flash head 132 x 132 x 32mm/control unit 116 x 71 x 48mm
