Impact VC-500WLN-II 500Ws Digital Monolight - Manual (Page 22)

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Groups
The Impact Digital Monolight has multiple groups, used to segment remote
devices. Press the group selector button repeatedly to select the group that
corresponds to the lights you want to trigger.
Note: The group setting on the monolight and the transmitter must match in
order to wirelessly trigger the flash, adjust flash power, and turn on/off the
modeling lamp.
Testing the Monolight
Press the transmitter’s test button to test-fire the monolight.
Replacing the Battery (CR2032)
To install a battery into the wireless trigger, first remove the battery compartment
door. Remove the spent battery by holding back the clasp and pulling the battery
out. Insert the new battery under the clasp, using the correct orientation, and
snap the other side into place. Reinstall the battery compartment door.