The LFG-120 is a much older unit (probably from the early 1970's). The power is much less than the 2260. Still it may work so long as it has a good transducer. There were many versions of the green box starting around 1960 (preceded by the red box in the late 1950's). The early ones were very low power and actually had to be tuned to the transducer by the factory or a service center to work properly. The latest versions (the model P-300E from the mid 1980's) were equivalent to the 2260. The oldest ones were called the LO-K-TOR and had a 0-100 ft scale). I would stay away from them due to the factory tuning thing. The new ones were the LFP-300 series and had a 0-60 ft range and some had dual range. So long as they have a good transducer, they should work OK for $50 or less.
I just put this extra info in as many folks ask about these units every year. I hope this helps.
Good luck.
Norm