Dual LED Digital Display Voltmeter Thermometer Cigarette Lighter USB Car Charger (Blue, Red) Features: High efficiency USB 5V 2.1A output for fast charging. Apply B 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. Specifications: Material: Metal, Plastic Shell color: Black Input Voltage:12-24V USB Output: 5V 2.1A Connection: Cigarette Lighter Plug(Just plug and play) Temperature Measurement Range: -10 degrees to +80 degrees     Display Color: Red thermometer display with green voltmeter display,                         Red thermometer display with blue voltmeter display(optional) Diameter: 4.3cm/1.69'' Total Length: 8cm/3.14'' Package Weight: approx. 50g Package Included: 1 x 3 In 1 USB Car Charger Adapter