The Interfit S1 is the lighting industry's first affordable, high quality advanced monolight to combine lithium-ion battery and international multi-voltage ac power adaptor into one comprehensive kit. Through The Lens Metering in TTL Mode uses the S1's entire 7-stop power range (500W - 7.8Ws), is automatically calculated in 1/10th stop increments and allows for ± 3 stops of exposure compensation. Manual Mode utilizes the entire 7-stop power range, controllable in 1/10th stop increments. High Speed Sync in Manual Mode at up to 1/8000th of a second shutter speed using the top 4 stops in the power range (500Ws - 62.5Ws) and is manually adjustable in 1/3-stop increments. Package includes: International Multi-Voltage AC Adapter that can power the unit with or without the battery in place, maximizing battery longevity. The integrated and exchangeable lithium-ion battery sits flush with the flash body, offers 350 full power flashes and allows for cable-free and rapid setup and repositioning of lights when power outlets are not available at a shoot. The S1 is Color Accurate to within ±100 Kelvin using IGBT technology. This technology also allows for Short Flash Duration between 1/1000th to 1/9000th of a second; useful for freezing action and sports motion. Integrated Wireless remote technology offers TTL flash exposure compensation and manual power control in three groups using the S1 Remotes for Canon or Nikon (sold separately). The Frosted Glass Dome softens and disperses light evenly through large and small light modifiers while protecting the user-replaceable flash tube. Aluminum Construction with an attractive matte finish gives the unit greater heat dispersion efficiency and durability. The S1 features the ever popular Bowens® S-Type Mount, making it compatible with a large scope of adapter rings and modifiers such as softboxes, beauty dishes, reflectors, and grids. Allowing for firmware upgrades, the S1 is easily updatable, when new camera models are released.