This is a great fast charger for demanding and powerful devices. Charges my 6150mAh monster battery Power 3 phone within 3 hours, which is excellent, regular charger will take about 8 hours to charge. I'm using USB C port (more powerful) most of the time, while for charging my watch (small battery) usb-3 is enough. This charger also comes handy when need to charge my power bank, only took about 5 hours for 15000 mAh usually it takes whole night and a bit. Reliable and well built charger.