The Priolite M-Pack1000 Mobile Power Pack is like having an MBX000, but without the flash tube and modeling light. It's designed as a power source for the HEAD1000 flash head. Separating the head from the power source has the distinct advantage of allowing you to place a light source in tight or hard to reach places.
The HEAD1000 (purchased separately) measures only 8.3 x 7.0" as opposed the MBX1000's 15.7 x 7.0 " and weighs only 2.6 lb as opposed to the monolight's 7.0 lb. This makes the head a much safer bet when used on a boom above the talent or hanging overhead on ceiling supports that would be precarious with a heavier head.
In all other ways the M-Pack1000 operated like the MBX1000. In keeping with the sleek profile of its extruded aluminum alloy housing, the exchangeable Lithium-ion battery plugs flush into the rear control panel as if it were part of the panel. A 3.0 hour charge will give you 160 full power flashes and thousands of minimum power flashes. What's remarkable about the M-Pack1000 is that like the MBX1000 it recycles in only 2.5 seconds to full power and is capable of 5 minimum power flashes per second, without extending the recycling time as the battery depletes. If you need to stop action the pack offers flash durations of as short as 1/4,500 sec.
Triggering options include sync outlet, optical slave and a built-in radio receiver that requires separate purchase of a transmitter for use. Flash readiness is confirmed via a switchable audio signal and back-panel LED. Other conveniences include multi-voltage charging and a 16 - 1000W/s, power range variable in 1/10 increments. If your battery is depleted, you can run the M-Pack1000 on AC power through the battery and charger or swap it out with one of your MBX1000 batteries if you own both heads. The battery will commence charging when you stop shooting.
Note: separate purchase of HEAD1000 is required for use.