Features: -Build-in All-in-One Large Capacity Lithium Battery: Professional Li-ion battery (15.2V/4000mAh), 400 times full power flashes, 0.3-2.8s fast recycling time. -M model , can adjust power 1/1-1/128 , Front-curtain sync, Rear-curtain sync ; -Stable color temperature at 5500±200K over the entire power range. -You can shoulder the i6C/i6N while hand-hold the flash head, making your shooting easier. -15W LED Modeling Lamp: Brightness can be adjusted in 4 stops.(F3-0,F3-1,F3-2,F3-3 ) -With a Direction Adjusting Handle for easy control and better lighting angle. - Now Cononmark luanches a new HS receiver , i6C/i6N can work with speedlite Canon 600ex RT/ 580EXII as master , Nikon SB-700/SB-800/SB-900/SB-910,ect.