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Hi Jeanette - I don't want to sound like the harbinger of doom and gloom but maybe you should make a few enquiries before they take your money.
As in my last post on this subject, Supercheap Autos sell these types of units starting from just over $50, including ones with inflaters. Reading the ad links you've supplied, my first reaction was to the customer review of "Antionette" (sic) who claimed she used the unit twice before it packed up!!! Secondly, the bits about "do not use on larger power batteries (1000W)" and "do not use on batteries that exceed the power invert power."
Neither of these 2 statements in themselves have any basis of technical sense, though I appreciate what they may be referring to. As for the inverter, though it is a modest output unit, even coupling a device that uses 50-60 watts of power will need a constant current of 6-7amps (taking efficiency into account) over the intended usage time . This little unit is extremely unlikely to be able to supply aforesaid current for any length of time at all - they are designed to deliver a high current output for a few short "bursts" such as is required to jumpstart car batteries that have failed for whatever reason.
As stated, I don't want to sound depressive, but these are the facts when assessing the suitability of such equipment. My best regards, Darryl.
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