Macro Ring Lite JYC-670C E-TTL, fully automated ring light, automatic setting in P, A, S mode, for Canon cameras, Mod. JY-670C (US) TTL-Flash. Colour temperature: 5500K. Effective distance: 20cm-5m. Guide no : 14GN (ISO 100/meters). Flash Re-cycle time : depending on the flash power 0.1-5sn Flash Modes : Manuel, TTL and Stroboscopic (multi-flash) mode. Flash parameter can be set from the camera menu (supports remote control). Flash power control : 8 different levels (from 1/1 to 1/128). Flash ratio control : between 1/8-1/1 with 1/2 increments. Flash coverage : Approx. 20cm - 5m. Flash coverage angle : 80 degree. Flash AF Asist beam : 40 degree upward and downward, 45 degree left and right. Batteries: 4x AA (NOT included!). Battery life : 100 to 800 flashes (depending on flash power). Use of external battery pack to extend battery life possible. Manual in English only!