Profoto AirTLL remotes seamlessly connect your light with your camera, speeding up your workflow ideal for professional photographers. Thanks to High-Speed Sync (HSS) these wireless flash trigger remotes enable you to use the flash at any shutter speedSHUTTER SPEEDAperture, shutter speed and ISO form what is known as the exposure triangle in photography. Shutter speed is the length of time that a single frame is exposed for, more specifically how fast the shutter opens and closes to permit light entering the lens, to reach the sensor. A slow shutter speed means a longer exposure time useful for motion blur like the silky look of flowing water, whereas a fast shutter speed means a shorter exposure time useful for freezing the appearance of motion in images like a hummingbird in flight. It is measured in seconds starting at 1 second and halving our doubling in time. For example: 1/2s, 1/4s and 1/8s are all fractions of a second with 1/2s being the longest exposure time, 1/4s half of that and 1/8s another half etc. up to 1/8000th of a second, which means that you have full control of the ambient light even when shooting outdoors in sunlight. Profoto flash triggers and cables are the professional photographer's choice for shooting outdoor portraits.