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Features: Set power ratios of up to 16 groups of remote flashes; Switch the on-or-off of the modeling light or AF-assist beam& buzzer; Manual triggering of flashes; Two modes of power ratio display; Quite convenience to mount onto your camera's hot shoe Specifications: 16 Channels 16 groups of remote flashes Max. synchronize speed: 1/250 sec LCD Monitor 433 MHz WIRELESS Transmission Remote distance: 50 m (in clear area) Trigger + receiver set Suitable for: NEEWER TT850 TT860 SPEEDLITE Package Contents: 1x WIRELESS flash trigger 1x receiver