woocommerce_wp_text_input(
            array(
                'id'                => '_download_expiry',
                'value'             => -1 === $product_object->get_download_expiry( 'edit' ) ? '' : $product_object->get_download_expiry( 'edit' ),
                'label'             => __( 'Download expiry', 'woocommerce' ),