***** **********Best Quality Guranteed. *****Supports E-TTL auto flash mode and S1/S2 optical slave mode*****Hign GN. of 42 with compact size, supports MULTI flash mode, enables you to capture the intricate motion states*****LCD display enables precise control of brightness of the speedlight, change other settings with ease*****Comprehensive functions, easy to operate and nice build quality makes the speedflash friendly for beginers*****Overheat protection, automatic detection of flashlite temperature, extended service life.