About this USB Car Adapter Key Chain:

• Compact USB adapter designed for charging your device using your car’s cigarette lighter.
• Includes metal split ring to attach to your keys so you’ll never be without your device on the go.
• ABS Plastic swivel panel covers PC plastic port from debris in your bag or pocket.
• USB cable not included.
• Lights up red while charging.
• Power supply / Technology: INPUT: 12-24 volts, OUTPUT: 5.0V/1,000mA.
• Designed for use with most smartphones and mp3 players, not for use with tablets or laptops.
• NOTE: Charge time will not be as fast as normal AC outlet charging.

Do you know not all USB Car Chargers can charge your iPad. When choosing a car charger, one thing we should pay attention to is the output spec of the charger. The output decides what kind of device the charger can charge. Usually there are two kinds of USB output, 1 Amp and 2.1 Amp.

The 1 Amp USB port can charge smart phones like: iPhone, Amazon Fire Phone and some of the Nokia Windows Phones (Samsung Galaxy Series need 2.1 Amp).
The 2.1 Amp USB port charges most of the popular tablets and smart phones: iPad, Galaxy Tab, Galaxy, Kindle Fire HDX 8.9” and so on.
The 1 Amp charger can charge all devices with minimum input spec lower than 1 Amp.
The 2.1 Amp charger can charge all devices with minimum input spec lower than 2.1 Amp.