Here's what happens running the '-h' option:
BusyBox v1.18.3 (2011-02-11 12:08:19 PST) multi-call binary.
Usage: tar -[cxtzjZmvO] [-X FILE] [-f TARFILE] [-C DIR] [FILE]...
Create, extract, or list files from a tar file
Operation:
        c       Create
        x       Extract
        t       List
Options:
        f       Name of TARFILE ('-' for stdin/out)
        C       Change to DIR before operation
        v       Verbose
        z       (De)compress using gzip
        j       (De)compress using bzip2
        Z       (De)compress using compress
        O       Extract to stdout
        h       Follow symlinks
        m       Don't restore mtime
        exclude File to exclude
        X       File with names to exclude
        T       File with names to include
tc@box:~$