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Is this acceptable code to redirect mobile users?

After looking through many pages showing fairly large chunks of JS code (of which I am not fluent) I found this very very short code block which appears to work after a quick test from a Desktop and Mobile device. Is this good enough to use for a non-enterprise site?

<script>

if (navigator.userAgent.indexOf("Mobile") != -1) {
            window.location = "http://Domain.com/mobile.html"
            }
else {
    <!--Do nothing, remain on page-->
}

</script>


Thanks for any help! :)