def sync_l(self, option: str = 'all') -> None:
        '''List but don't copy.

        Args:
            option: 'system', 'vendor', 'oem', 'data', 'all'
        '''
        if option in ['system', 'vendor', 'oem', 'data', 'all']:
            self._execute('-s', self.device_sn, 'sync', '-l', option)
        else:
            raise ValueError('There is no option named: {!r}.'.format(option))