The present invention relates to a scanning method, more particularly, to a two-directions scanning method by using a user interface. A basic amino acid derivative represented by the formula :wherein each substituent is as defined in DESCRIPTION, or a salt thereof. The power device is coupled to the transformer for switching the transformer to product output of the power converter. This invention also relates to lettuce cultivars or breeding cultivars and plant parts derived from lettuce cultivar Paulita, to methods for producing other lettuce cultivars, lines or plant parts derived from lettuce cultivar Paulita and to the lettuce plants, varieties, and their parts derived from the use of those methods. In the one-way transmission mode, the personal device only receives the advertisement.