Cowboystudio SYK-3 Optical Slave Trigger
# This Hot Shoe Flash Remote Slave Trigger has a sensor to sense light from the main flash so as to trigger the slave flash wireless.# This slave sensor triggers the flash attached to it when it senses the light from the main flash.# Great for setting up slave flash for fill light, hair light and background light.# Work with most flash units using universal hot shoe like Nikon, Sigma, Olympus, Pentax (except Minolta and Sony as they use a special hot shoe, except Canon)