PS/SP add event receiver to list

$wUrl  = "http://contoso/sites/ITS"
$w = Get-SPWeb $wUrl
$l = $w.Lists["Accomplishments"]
$er = $l.EventReceivers.Add()
$er.Name = "Update security"
$er.Type = [Microsoft.SharePoint.SPEventReceiverType]::ItemUpdated
$er.Assembly = "contoso.accomplishments, Version=1.0.0.0, Culture=neutral, PublicKeyToken=ece777032666aa8f"
$er.Class = "contoso.accomplishments.AccomplishmentsEventReceiver"
$er.Synchronization = [Microsoft.SharePoint.SPEventReceiverSynchronization]::Synchronous
$er.Update()