TRIOPO TR-15EX Macro Ring TTL Flash Light with 6 Different Size Adapter Rings For Nikon I-TTL (Black) Features 1. 2.9 seconds high speed recycle time and support LED assist lamp, not let you miss very weonderful moment 2. Multiple flash mode: TTL auto flash for convenient operation as normal auta exposure, multi flash mode and rear curtain sync for shooting a moving object 3. Flash with adjustable 8 grades flash brightness, design for a complete picture with paticular subject and accurate exposure 4. Dot-matrix LCD display with backlight mode, can achieve easy adjustment for clear night photography 5. Compatible with Nikon I-TTL series. Specifications 1. Model: TR-15EX 2. Camera type: For Nikon camera: I-TTL 3. Power supply: 4 x AA size Batteris(Alkaline or Ni-MH Batteries, not included) 4. Guide No. ((ISO 100): GN14 5. Number of flash (full power: 11): Approx 450 times 6. MS1S2 mode control flash: 1128~11 7. RPT mode control flash: 1128~14 8. High speed sync mode: 132~11 9. Recycle time: 0.05~2.8s 10. Color temperature: 5600K+-200K 11. Flash duration: 1300s - 110000s 12. Flash trigger: 3.5mm PC sync hole, optical control, test key, wireless control plug 13. Illuminance Full LUX: 440LUX (0.5m)