Neewer 433MHz Wireless 16 Channel Flash Remote Trigger with Receiver for TT850, TT860 Speedlite and Godox V850, V860 Speedlite 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