Powerextra DF-400 Flash Speedlite with M/S1/S2 Mode, Camera Flash for Canon Nikon Pentax Samsung Fujifilm Olympus Panasonic Sigma Minolta Leica Ricoh DSLR Digital Cameras with Single-Contact Hot Shoe

The flash has 8 level of power output control which indicated by 8 pieces of LED lamp for different level.Powered by 4 pcs AA-size battery backup, provides PC port, you can make the flash synchronous by connecting to the PC por'