Product Description Paul C. Buff™ Einstein™ Flash Unit 9 f-stop power variability (2.5 Ws to 640 Ws) Adjustable in precise 1/10 f-stops All-digital control from LCD display Global plug-and-play from 95 to 265 VAC Action-stopping flash durations as short as 1/13,500 sec. (t.1) Color consistency +/- 50K at any power Bright, adjustable 250 W modeling lamp Frosted dome cover reduces UV emission Audible and visual recycle indicators Compatible with all BUFF light modifiers, light stands, CyberSync™ remotes, and Vagabond™ systems The Einstein™ Flash Unit features action stopping flash durations, color consistency, and the broadest power range. The flexibility of the power range allows for everything from over-powering the sun, to shooting indoor portraits with a wide-open aperture.Perfect for: Professional photographers in any field.Sync Cord Compatibility: All Paul C. Buff, Inc. flash units arrive with a 15' sync cord for connecting to a camera's PC sync terminal. Not all camera's are equipped with a PC sync terminal. If you plan on using this cable, and not wireless remotes, you may need a hot shoe adapter. Check your camera's compatibility. Paul C. Buff™ CyberSync™ Trigger Transmitter 3 The CyberSync™ Trigger Transmitter mounts onto your camera's hot shoe to provide wireless firing. When your camera shutter is pressed, the CST3 will simultaneously send the firing signal to all of the flash units in your setup that are fitted with CyberSync™ receivers or transceivers. Simply match the frequencies across all components and you’re ready to shoot!