Dual USB QC3.0 Ports: With 18W super power and 18W dual USB 3.0 outlets, this car charger adapter charges two devices simultaneously and provides Android cellphones (with Qualcomm fast charging protocol ) 4 times faster than conventional 5V/2A (10W) car chargers Colorful Digital Voltmeter & Switch: As a smart fast charger, this USB car charger with colorful voltage display and high voltage warning to show car battery charging rate in time. In addition, the switch is free to switch the display mode and turn on/off the power when the item is not in use. LED screen works when connected Automatic identification: Dual USB vehicle charger built in smart chip to identify automatically and based on devices needs/power status - Improved charging technology avoids overcharging to protect phones or other digital devices. Wide Compatibility: This USB car charger can be installed on any 12V-24V vehicle on cars, motorcycles, marines, UTVs, SUVs, RVs, yachts, etc. It can be smartly compatible with multiple devices such as mobiles, tablets, cameras, GPS navigation and other digital devices at the same time. Multiple Protection: Provides six protections against overcurrent, overload, short circuit, overvoltage and overheating. Automotive charging adapter with smart chip for charging and discharging control. When the input voltage exceeds 14.6V, the red indicator lights up. It not only improves charging efficiency, but also protects your digital devices.