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Buying advice: For Laptops match model numbers and buy specific and original part where possible. Multi-voltage/switchable voltage supplies can work but are more expensive - check connectors supplied. For smartphones get original for phone or from the manufacturer or with stated certification. Cheaper third party options aren’t recommended. For other general or nonspecific devices match the voltage exactly and ensure the current output is equal to or more than needed (device will only draw what it needs to). Spec should be written on the device. Check connector type matches for size and design. Also check polarity/orientation of connector is right way around - i.e. center positive or center negative.