slickをスマホのみ適用させる方法

<script>
	function checkBreakPoint() {
		w = $(window).width();
		if (w <= 769) {
			$('.mv-slick').not('.slick-initialized').slick({
				speed: 1000,
				dots: true,
				arrows: true,
			});
		} else {
			$('.mv-slick.slick-initialized').slick('unslick');
		}
	}
	$(window).resize(function(){
		checkBreakPoint();
	});
	checkBreakPoint();
</script>