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High efficiency USB 5V 2.1A output for fast charging. Apply to USB charging mobile phones or other electronic products The thermometer monitors the air temperature clearly providing more comfortable atmosphere for you Comes with voltage meter tester for real-time detect the battery voltage for your vehicle It is easy to connect the battery. Using the cigarette lighter plug, just plug and play It is suitable for most of 12V-24V vehicles, such as cars, SUVs, trucks, etc