This unit is twice as fast as the 054X. Special connectors to handle the high current necessary for this amazing recycling rate will only fit the current style (028/C Ultra Battery) or (029K). This is strongly recommended for anyone who really plans to push the equipment hard.
High Speed Modules allow you to make the recycling times faster that any other brand of portable flashes at any power level offered.
HSMs speed up the recycle for any power pack
Only use HSMs with larger Batteries- Never a Mini or a Regular
The Vehicle Battery Kompartment (029K) may be used with HSMs as if it were an Ultra Battery
HSMs are not for use with the AC Supplies or Vehicle Adapters
Put the HSMs next to the Battery at the bottom of the system and the system automatically recycles faster in every setting.