Im use icheck and I want to checkAll icheck

I use icheck class class=flat-red .I want check All in icheck

<div class="form-group" >
  <input type="checkbox" class="flat-red " id="checkAll"   >
  Check All
</div>
<div id="checkDetails">
  <div class="form-group">
    1<input type="checkbox" class="flat-red check" >
  </div>
  <div class="form-group">
    2<input type="checkbox" class="flat-red check">
  </div>
  <div class="form-group">
    3<input type="checkbox" class="flat-red check">
  </div>
  <div class="form-group">
    4<input type="checkbox" class="flat-red check">
  </div>
  <div class="form-group">
    5<input type="checkbox" class="flat-red check">
  </div>
  <div class="form-group">
    6<input type="checkbox" class="flat-red check">
  </div>
  <div class="form-group">
    7<input type="checkbox" class="flat-red check">
  </div>
</div>

$(function () { 
  var checkAll = $('input#checkAll'); 
  var checkboxes = $('input.flat-red'); 
  checkAll.on('ifChecked ifUnchecked', function(event) { 
    if (event.type == 'ifChecked') { 
      checkboxes.iCheck('check'); 
    } else { 
      checkboxes.iCheck('uncheck'); 
    } 
  }); 
  checkboxes.on('ifChanged', function(event { 
    if(checkboxes.filter(':checked').length == checkboxes.length) { 
      checkAll.prop('checked', 'checked'); 
    } else { 
      checkAll.removeProp('checked'); 
    } 
    checkAll.iCheck('update'); 
  }); 
});