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Lapfuture Laptop charger Compatible For SAMSUNG NP-R780 NP-R719 NP-R590 NP-R509 NP-R580 NP-R530 19V 4.74A 5.5mm X 3.0mm Pin Dia Adapter With 1.5M Power Cable Free. | How to choose a suitable charger for your laptop? Check the DC output V&A of your original with can be found in the label of your original charger. Make sure the output volts and amps are 19V 4.74A 90W. Exactly the same as your original. Check the connector of your original. Make sure the connector size is 5.5mm*3.0mm|