This jump-starter, air compressor, inverter, is of excellent quality and usefulness. As mentioned in other reviews, it would be nice if they included an AC power cord; and possibly a DC power/charging cord for the price. This is a fairly large unit and takes up a large amount of room in a trunk or the back of a station wagon/hatchback. It charges fast and has plenty of reserve power to start our motor home or inflate large tires. Great carry handle.
UPDATE 19 May 2011: The user manual was missing. Now I need it to check something. Item itself is pretty user friendly. Tried to download manual on website from manufacturer (UPGI.com) but no manuals or documents available from support. None available from Energizer. Tried Google. No one has uploaded manual yet. Finally found support 800 number for UPG Inc. which is also a wholesale/retail sales number. Nice lady answered. She took my name, email, telephone, address, etc. Said she would "look around" for one and send it "somehow" if she finds one.
Apparently, this is a "marketing arrangement" where they buy the use of the Energizer name, then import and distribute it.
Design pretty good. Sales-marketing good. Support not so good. Technical support essentially non-existant. Downgraded to two stars. Will post another update if I ever get the manual.