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Poweradd 3-Port 4.2A (21W) USB Car Charger with Built-In MicroUSB Cable [amazon.com]
Apply Code: P749N7OQ at checkout.
Price (after coupon): $ 4.99

-Three USB-port + built-in micro usb cable, charging four devices at the same time.
-Two 2.1A output ensure maximum charging speed for tablets and smartphones,and can be used simultaneously with 4.2A max output.
-The little 3.4-inch-long car charger designed lightweight for maximum portability,perfect for long road travel.
-Blue led indicator keeps light on once your device is charging and car charger is -High-quality with overloaded and short circuit protection keep your vehicle and device from harm.