Cavo di ricarica USB Power Boost DC 5V a 9V/12V 1A 2,1x5,5mm convertitore step up
(9V, 12V boost line output 1A, if you are more than 1A, you can't use it). USB power cable USB to DC 5.5 2.1mm. [The difference between the two lines]. 2: Power plug size specification.