returns the product key of the device . the product key must be unique for each device type , and is mandatory to configure the device properly . concode_field_sep String itemName concode_elem_sep InsteonAddress address concode_elem_sep String feature concode_elem_sep String productKey concode_elem_sep HashMap<String,String> params concode_field_sep String getItemName concode_elem_sep HashMap<String,String> getParameters concode_elem_sep InsteonAddress getAddress concode_elem_sep String toString concode_elem_sep String getFeature concode_elem_sep String getParameter
String function ( ) { return productKey ; }