BoxWave Dual-Port Rapid Amazon Kindle Fire HDX 8.9 USB Car Charger - Universal 2-Port, Dual USB Car Charger for Amazon Kindle Fire HDX 8.9 - 3.1 Amps (3.1 Amps - Black) Quickly and safely charges up to two power hungry devices simultaneously Small and compact in size with a sleek appearance Safely rapid charge your device; Intelligent chip design prevents overcharging Compatible with Amazon Kindle Fire HDX 8.9 and all USB compatible devices Input 9V; Output: 3.1Amps