The ZenFone AR supports Qualcomm Quick Charge 3.0 which allows you to charge your phone up t 40% faster. Charging time is the same in 2.0, but 3.0 brings improved efficiency. Using a smart battery management technology make it quick and easy to charge your battery. This advanced battery charging technology automatically identifies the exact power needed to charge your particular battery in your phone and therefore applied the most efficient charge and results in 38% less power loss compared to 2.0 also helps to prevent overheating and other kind of problems that results in improper or or non-exists power power management. Quick Charge 3.0 charger communicated with the device and coordinating the appropriate charge rate and voltage and applies the most suitable charge settings for it.
So why do you want a phone that supports Quick Charge 3.0? Mainly for just being able to quickly charge your phone on the go. sometimes you have only a limited time to charge the phone, and with the ZenFone AR, you can charge 60% of the battery capacity just under 40 minutes. It's great for travelers who want to quickly charge the battery while traveling on train, eating in a restaurant and just charge it wherever possible and still get a good charge that can last for a few hours of usage.
Just for general knowledge, Qualcomm also announced Quick Charge 4 in November 2016, that can charge your phone even faster and can give you 5 hours worth of battery life in just 5 minutes of charge or 0 to 50% charge in 15 minutes (charging a 2750mAh battery as mentioned in the press release). This technology will be available in the upcoming Snapdragon 835 processor, so if fast battery technology is really important for you, you probably want to check out the phones that do support this new technology, but the Zenfone AR uses the previous Quick Charge 3.0 version, not the new 4.0 one.