Differences between SB-400 and SB-401?

[Harvey Mitchell]

Can someone please advise me the main differences between the SB-400 and
SB-401?  I have an SB-400 that I would like to use with my SB-301, but
unfortunately the manual I have is for the SB-401, and I haven't found any
info on the internet about the SB-400.

Thanks,

Harvey Mitchell, K5YU

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