Review on Powerful Dual Port Car Charger: BESTEK 150W 2-Socket Cigarette Lighter Adapter for iPhone X/8/7/6s/6 Plus, iPad, Samsung Galaxy S9/S9 Plus and More by Eric Speers

It has good reviews because it used to be quite powerful, but today's smartphones and tablets require far more power than they can provide. Even when using the stronger 2V output, my smartphone batteries are slowly draining instead of charging. What you're looking for currently (in 2018) is 6.8A, not the 3.1A provided by this device (btw this is the total for all ports; this will never give you more than 2A from give to a single port).