VEVOR Level 2 EV Charger, 24 Amp 110-240V, Portable Electric Vehicle Charger with 25 ft J1772 Charging Cable NEMA 10-30 Plug, 10/16/20/24A Adjustable Plug-in Home EV Charging Station for Electric Cars
I had to learn this from the typo-riddled manual To adjust the amperage, after plugging in to power source but before plugging in to car, press the button on the control front until the front LEDs give desired voltage.