It is interesting that the website says you can use them at 9 or 18V. I
had several email discussions with one their techs a few years ago who
said it had to be 18V to supply the proper reference point to operate
properly. Actually I did try it with 9V anyway and it seemed fine.
Chris
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53 Year Old Mom Looks 33
The Stunning Results of Her Wrinkle Trick Has Botox Doctors Worried
http://thirdpartyoffers.juno.com/TGL3141/4f38fb5d304e513e1dbdst01duc
David Fung