def METHOD_NAME(self):
    """
    Retrieves the model number (or part number) of the device
    Returns:
        string: Model/part number of device
    """
    model = 'Unknow'
    attr_path = self.__psu_model_attr
    attr_rv = self.__get_attr_value(attr_path)
    if attr_rv != 'ERR':
        if attr_rv != '':
            model = attr_rv
    else:
        raise SyntaxError
    return model