The link covers DC to DC Converters you will need to plug this in so it gets the right voltage.
Most of the stuff that we have is convertible to Solar Pluggables.
To Buy this stuff in an RV store, if you can, will be a very expensive proposition.
Hawai'i does not even have an RV store, where we gonna drive to?
We do have a boat supply store that supplies many high priced Jim Cracks and Thing Ah Ma Bobs if ya like gettin' raped on the price.
This 'Cassio Label It' uses 4 AA batteries and I don't like to buy batteries.
Not even Rechargeables.
So I did a little surgery. . .