Neewer&reg; 600W GN87 HSS Outdoor Flash Strobe Light with 2.4G Wireless System & 8700mAh Rechargeable Battery to Provide 500 Full Power Flashes Recycle in 0.01-2.5s Bowen Mount NW600BM 600W strong power,0.01-2.5s recycle time, 500 times full power output, GN87, 9steps(1/256 to 1/1) power output High quality lighting and great portability,Equipped with a 10w LED modelling lamp and a big capacacity lithium battery pack (11.1v/8700mAh). You need to buy Neewer N1 Trigger additionally to use the wireless functions of this flash. Support M/Multi flash system of Canon,Nikon,etc;Slave unit in a wireless flash group,2.4G Wireless transmission and Wireless control. Dot-matrix large LCD screen, easy to understand and control;Support USB firmware upgrade,have 3.5mm sync jack; Bowen Mount outdoor flash to enable mouting your bowen mount accessories, umbrella hole for inserting your photography umbrella for more dynamic effect.