Features: Dual selector dialsGroups A, B and C, eight channelsFold-out standStandard PC sync Features: Support original and non-NAS compatible flashesBuilt-in 2.4 GHz wireless receiverMetal coldshoe1.4 inch tripod socket Nissin Air System Receiver The Air R Receiver is the perfect addition for wireless flash shooting either in a studio situation or on-location. When compared with the traditional optical wireless transmitters, the 2.4 GHz radio reception is less susceptible to angle and obstacle limitations, providing signal reception of up to 98 feet. Flexible combinations: The Nissin Air R Receiver can be combined with original flash models as well as all other Nissin non-NAS compatible flashes to provide a near limitless variety of lighting possibilities. Please note that it is not possible to combine cross-system Air R units - An Air 1 for Canon cannot be combined with an Air R for Nikon for example. Nissin is one of Japan's leading manufacturers of electronic flash units. Nissin has supplied high quality lighting to the worldwide photographic community for over 50 years. Nissin has maintained exceptional quality standards over all these years. Generations of photographers have relied on Nissin Flashes for their lighting needs. The Nissin Story Nissin was founded in 1959 and released their first professional oriented flash, PRIMO, in 1967. In 1987 Nissin introduced its first dedicated auto focus flashes with the now common red beam auto focus assist light. 2007 brought with it, the Nissin Di622; the first in the new line up of flashes designed specifically for the emerging digital SLR market. Many award-winning flashes were to follow including the Di866, MG8000, i40, Di700A to name a few. Nissin continues to think outside of the box with innovative new products continually coming to market.”