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I want the following:

{if isset($products) AND $products}
             {$tabname=rand()+count($products)}
            {if isset($display_mode) && $display_mode == 'carousel'}
                {include file="{$items_owl_carousel_tpl}" items=$products image_size=$image_size}
            {else}
                {if device is MOBILE}  
                    {include file="{$items_normal_tpl}" items=$products image_size="homepage_default"}
                {else device is NOT MOBILE}
                    {include file="{$items_normal_tpl}" items=$products image_size="home_default"}
                {/if}
            {/if}
        {/if}

What codes should I enter in the IF condition to make sure it detects mobile and not mobile.

Also is the IF condition written properly, what should i change in this code?

This is TPL File.