If you are going to spend the money on USB outlets, either those that plug into power outlet (aka lighter socket) or the round ones that fit thru a inch+ hole, buy ones that are marked and certified the Qualcomm v3.0 quick charge protocol. They are usually marked QC 3.0 or similar on the face of them. Many new phones and devices use this protocol and even if they don't the charger will safely charge whatever you have. My old Droid and my new Moto both use the QC 3.0 and charge significantly faster with it. When I plug into a regular charger it will say "charging" and if I plug into a QC 3.0 charger, it will say "turbo charging". I use them in the car, the truck and the trailer. The price difference is insignificant and well worth it.
My new phone has a Micro C plug so I bought new heavier cords about 6 ft for the trailer, and bought some Micro C to Micro adapters that have chains on them so I keep them clipped to the cords and won't get lost.
Charles