The GS300II 300Ws Monolight from Godox is a versatile flash head with solid core and convenience features. The strobe has power that's variable from 1/32 to 1/1 and recycling times from 0.3 - 1.5 sec. The 150W modeling light can be set to Proportional to mimic the effects of the flash's power setting for pre-visualizing your photo, or it can be adjusted from 5 - 100% output. Both the power and the modeling light can be adjusted remotely with the separate purchase of a transmitter, since the head has a built-in 2.4 GHz wireless receiver. The optional XT16 or FT-16 transmitter will give you triggering and control of the flash head's functions while the X1 TTL, as its name denotes, adds TTL exposure functionality to the system. Settings are visible on the flash head's digital readout. The GS300II has a Bowens front accessory mount that allows it to use not only Godox modifiers, but also accessories from the many manufacturers that use this popular mount. The GS300II ships with a tilting umbrella bracket, standard reflector, glass protection dome, and a lamp cover. Benefits Built-in Godox 2.4 GHz wireless X system Wireless power control and flash triggering 0.3 - 1.5 sec recycle time and 1/2000 - 1/800 sec. flash duration Output variable from 1/32 to 1/1 in 50 step increments 150W modeling lamp adjusts from 5-100% Popular Bowens mount for light shapers Anti-pre-flash function allows sync with cameras that have a one-pre-flash firing system Auto recover the adjusted setting after a restart Built-In Godox 2.4 GHz Wireless X System Use X1 TTL wireless flash trigger or XT16 or FT-16 remote controls for wireless function adjustments Wireless system has 32 channels and can handle 16 groups of flashes 3 Modeling light modes: Off, Proportional and Percentage (5-100%) Adjustable power level, modeling light, and full recycling beep indicator Use in combination with any flash with built-in Godox Wireless X System