Description rapid charging: the charger plugs into any standard wall outlet via the included ac adapter, and its compact design means it is small enough to throw in a briefcase or backpack when you’re on the go. The charger plugs technology powers your phone while it charges its battery, so you can make calls, check your messages or browse the web while your phone is charging. Additionally, it comes packed with adaptive fast charging technology that will charge cellphone with that feature built-in at an even faster rate!

Flexibility: the charger also comes with a detachable usb to micro usb cable, which allows you to charge your phone from the usb port on your computer or other usb power source if you aren’t near a wall outlet. You can also sync and transfer files between your computer and galaxy smartphone or other phone using the micro usb cable. Keep one at home and one in your bag to make sure that your phone is always ready.

For fast charging, you're looking at something that bumps the voltage up 5v, 9v, 12v, and beyond, or increases amperage to 3a and above. Keep in mind, your device will only take in as much power as its charging circuit

the output of a charge is measured in amperage(a) and voltage(v) amperage (or current) is the amount of electricity flowing from the battery to the connected device, while voltage is the strength of the electric current. Multiplying volts by amps gives you wattage, the measure of total power.

Standard usb 3.0 ports output at a level of 5v/1a for smaller devices like wearables. Most phones and other devices are capable of handling 5v/2.4a. For fast charging, you're looking at something that bumps the voltage up 5v, 9v, 12v, and beyond, or increases amperage to 3a and above.