All capabilities function from the onboard microprocessor, which communicates on to your battery. The MP00205A starts with high amperage to get the battery charged up fast, after which you can slows down automatically to the reduced amperage as it reaches capacity. Most phones and tablets will get moderately fast charging, https://johnnylewof.wannawiki.com/403113/usb_c_and_usb_a_car_charger_for_dummies