You can adjust the LED lightness to preview focus,which make your photography as perfect as you want. Power Supply: Longlife Lithium Battery Support Synchronization of front and rear curtains Flash Exposure Compensation In the same way as normal exposure compensation,you can set exposure compensation for flash.The flash exposure compensation amount can be set up yp ±3 stops in 1/3-stop increments. Memory function The speedlite will recover the last mode and setting when it is turned on again. Temperature detection automatically Specifications Guide Number:42(ISO100 ,105mm) Flash mode:TTL M S1 S2 RPT Adjustable angle:up-down 0-90 degrees, right-left 0-360 degrees Package included: (Note:battery is not included) 1x MK420 For Fujifilm Camera 1x Diffuser 1x Charger 1x stand.