b' Features: Multi-function car LCD digital display With car charger, and can real-time monitor temperature and car voltage To ensure the safety of your car Easy to install, no needed the professional skill Provide extremely convenience Function 1: Car-Mounted Charger Function 2: Simply plug into cigarette socket, Instant conformation of battery voltage, Low power consumption high light dispaly Function 3: Digital Thermometer Specifications: Color: Black LCD Indicator Color: Blue+red/Green+Red, Red+Red Voltage Measuring Range: for DC 8-40V Input Voltage: 12~24V Output Voltage: 5.0V Maximum Output Current: 2.1A Temperature Measuring Range: -10~80 Length: 8cm/3.15 Diameter: 4cm/1.57 Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement.pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Contents: 1 x USB Car Voltmeter Thermometer'