Flask WTF-Form - Custom rendering a Form with select

template.html

        <div class="row text-left">
            <div class="col-md-4 col-md-offset-4">
                <form action="" method="POST" role="form" class="form">
                    <!--Errors + CSRF-->
                    {{ form.hidden_tag() }} {{ wtf.form_errors(form, hiddens="only") }}
                    {% for field, errors in form.errors.items() %}
                        <div class="alert alert-error">
                            {{ form[field].label }}: {{ ', '.join(errors) }}
                        </div>
                    {% endfor %}
                    <!--Form Fields-->
                    <div class="form-group required">
                        <label class="control-label" for="device_name">Modellname</label>
                        {{ form.device_name(class="form-control",id="device_name",required="required",type="text",placeholder="J3 2017") }}
                    </div>
                    <div class="form-group required">
                        <label class="control-label" for="device_code">Modellnummer</label>
                        {{ form.device_code(class="form-control",id="device_code",required="required",type="text",placeholder="J320F") }}
                        <span class="text-left text-muted">{{ form.device_code.description }}</span>
                    </div>
                    <div class="form-group required">
                        <label for="manufacturer">Herrsteller</label>
                        <label class="control-label" for="manufacturer">Herrsteller</label>
                        {{ form.manufacturer_id(class="form-control",id="manufacturer",required="required",type="select") }}

                    </div>
                    {{ form.submit(class="btn btn-success btn-block") }}
                </form>
            </div>
        </div>