Description:Dual USB 3.1A output.With temperature and current meter tester.Easy to satisfy your need with dual USB socket.Fixed support helps stabilize the USB car charger.Multifunction product with 10A protection tube， perfect for travel use.Apply to all USB charging mobile phones or other electronic products.This easily installed 5V， 2.1A output port holds your smart phone， GPS， MP3.Optimized for iPad， iPhone and iPod-fast loading at full speed.(2.1 amps for iPad， 1 amp for iPhone / iPod.)Type: 4 in 1 Car ChargerColor: BlackLCD Digital Color: BlueOutput Interface: USBInput Voltage: DC 12-24V (Error of plus or minus 0.2V)Output Voltage: DC 5V (Error of plus or minus 0.1A)Outout Current: 3.1AVoltage Measuring Range: 5-25VCurrent Measuring Range: 0.1A-3.1ACompatible Brand: UniversalCompatible Model: UniversalConversion Efficiency: 95%Temperature Measurement Range: -20 degrees to +80 degrees (Error of plus or minus 1 degree)Size: 42mm x 78mm x 30mm (Approx.)Package Included:1 x 4 In 1 Dual USB Car Charger Adapter