public function get_preview_icon_html() {

		$html = '';

		if ( llms_is_user_enrolled( get_current_user_id(), $this->get( 'id' ) ) ) {

			if ( $this->is_complete() || apply_filters( 'lifterlms_display_lesson_complete_placeholders', true ) ) {

				$html = '<span class="llms-lesson-complete"><i class="fa fa-' . apply_filters( 'lifterlms_lesson_complete_icon', 'check-circle' ) . '"></i></span>';

			}
		} elseif ( $this->is_free() ) {

			$html = '<span class="llms-icon-free">' . __( 'FREE', 'lifterlms' ) . '</span>';

		}

		return apply_filters( 'llms_get_preview_icon_html', $html );

	}