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You're lucky. That's not only an isolation transformer it's a voltage regulating power transformer. If you have unstable line voltage that would thing will take anything from 95-130V with awful fluctuations (even a lost cycle or 2 of AC) and spit out rock solid 118V.
I have 3 of those style regulating isolation transformers and use them keep my tube sets from blooming when the local grid gets squirrelly.
The only bad thing about it is it's only 120W so it's only good for radios and some lower power monochrome TVs (IIRC if you overload these it's bad for them and output voltage slumps substantially and looses regulation).
This is an isolation transformer with 2 primary (input) windings and one secondary (output) winding. If you wire the primary windings in parallel it will take ~110V as it's input voltage, if you wire the primary windings in series it will take ~240V as it's input voltage. It could be wired either way you'll have to check. If you plan on powering it off 120V you can just plug it in to check...If it's wired for 120V output voltage will be normal, if it's wired for 240V output voltage will be low. You can't damage it with a 120V input.
These style of transformers do tend to make significant audible hum... It'll seem weird at first but you'll eventually get used to it knowing it's normal.
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