Genuine Acer chromebook series are listed below, so simply select the Chromebook series your model belongs to and this will display all the models along with the correct specification of Acer chromebook charger, these can variety from the micro 1.1mm diameter connector which powers mainly at 45w with the more powerful but rarer models using 65w or the ever increasing presence of USB type C means a lot of the newer models are supporting charging via a USB-C charger, if you already know the specification of your Acer chromebook ac adapter, these can be found listed at the bottom by voltage and wattage.