1.SAFE SMART CHARGING4 USB charging ports with total max 5V/3.6A output current enables you to rapidly charge multiple devices simultaneously. It built-in SMART IC technology intelligently detects your devices to deliver optimal fastest charging speed.^ 2.3 CIGARETTE LIGHTER SOCKETS12V/24V provide a total power up to 100W. Enough for simultaneous use of a variety of portable appliances in your vehicle, like GPS, DVR, Dash Cam, Car Vacuum cleaner and other car electric appliances etc.^ 3.ALL AROUND PROTECTIONBuild-in PPTC Auto-recovery replaceable 7A FUSE prevent from over-current, over-voltage, and short-circuit protection. This car charger adapter will automatically shut off when temperature is high or overload. Then it come back to work when temperature is normal or cut off high-power devices.^ 4.EASY ON/OFF POWER SWITCHComes with master power button, the car charger dont drain your car battery when button turns off. And the independent button is for each lighter socket. It will expand lifespan of the Car Power Adapter effectively by saving you from repeatedly plug in and out.^ 5.LED DISPLAY MONITORThe digital LED voltmeter display helps to monitor the health of your car battery in time. Numbers on LED display would flash if your car battery is abnormal or PTC fuse is automatically cut off.