This is THE BEST 12 volt dual charger I have bought, and I have bought and burned out many. The issue with many of these 12 volt charges is that they do not put out 2.1 amps of power. Some will put out 2.1 amps on one port and 1 amp in the second port. NOT THIS ONE, this one puts out 10 watts and 2.1. amps out of each USB port.
So, this means that you can use this to run a tablet, Apple or Droid at the helm and also charge a cell phone. It also means that you can charge two cell phones or one cell phone and one table at the same time off one 12 volt outlet. This is the charger to buy. I have three of these. They are great.
Here is the name:
Griffin Power Jolt Dual # 39750
It cost about $25.00
Here is the company, but I buy from Amazon Prime for about $20
store.griffintechnology.com/powerjolt-dual-universal-10-watt
Hayden