\documentclass[review,number,sort&compress]{article}

\usepackage{units}
%\usepackage[colorlinks,urlcolor=black]{hyperref}
\usepackage{siunitx}
\usepackage{cleveref}

\begin{document}
$\unit[1.1 \times 10^{-3}]{km}$

and the same as display:
\begin{displaymath}
\unit[1.1 \times 10^{-3}]{km}
\end{displaymath}

SI Unit package test

This is the old text \SI{600}{\meter\per\second}




\end{document}
