The Lumedyne X4BC 400W/s Booster Module is the smallest, lightest, easiest and least expensive way to add an f-stop to a 400W/s power pack system.
Boosters only effect the highest setting on a power pack. Boosters require a power pack to run from a battery.
LU073 Booster Module
One Year Warranty Registration Card
Lumedyne X4BC 400W/s Booster Module