Dual USB output charging at the same time.12-24V voltage design, compatible with most models.3.1A high speed output to charge digital devices.Concise red LED screen to display charging voltage and current, vehicle battery voltage.Protection against over-heat, over-current, safe and reliable.Universal Compatibility: Works with all USB-powered devices including Android & Apple smartphones & tablets.  Specifications:Item Type: Car ChargerMaterial: ABS+PC+Aluminum AlloyScreen shape: RoundColor: Blue/Gold/Silver /Black/RedInput voltage: DC 12V-24VOutput voltage: 5VOutput current: 3100mA