una/template/form_field_switcher.html

<div class="bx-switcher-cont __class__">__checkbox__
    <div class="bx-switcher-canvas">
        <div class="bx-switcher-on"><i class="sys-icon check"></i></div>
        <div class="bx-switcher-off"><i class="sys-icon times"></i></div>
        <div class="bx-switcher-handler">&nbsp;</div>
    </div>
</div>