1. Type: used for airborne flash close-up photography. 2. Compatible with Canon camera TTL. 3. Transmission distance: 20cm~5m. 4. Temperature color: 5500K. 5. Flash coverage: the up and down about 80° left and right is about 80°. 6. Flash reengineering: two sets of tubes flash together or separate flash of A group (group B). 7. Flash ratio control: 1:8-1:1-8:1 increases 1/2 mode. 8. Flash exposure compensation: manually. Flash exposure: increase 1/3 mode. 9. Flash light exposure confirmed: LED indicator on. 10. Focusing help light: help scope: up and down is about 40 ° / L/R is about 45 °. Light up time: about 20s. 11. Power back time: about 0.1~5s. Battery: 4 x AA batteries. 12. The fastest synchronous speed: 1/200-1/250s. 13. Battery service life: about 100~800 times flash. External power supply: compatible with Canon CP - E4 battery pack.