Precision Battery Voltage Monitoring TechnologyBuilt-in smart chips with intelligent Algorithm, accuracy of one thousandth voltage reference,display the message "CHG" and shut off the power when car battery low on power, display "HGH" when battery on high voltage.If your cigarette lighter continues to provide uninterrupted power after the engine stops, the charger can shut down the power after a 60 minute delay to reduces the risk of a dead battery Car Battery Voltage Early Warning Early warning on battery power remind you to maintain car battery on time. Usually, it's relying on battery indicator or our experience, such as engine can't start, to decide when to replace the car battery. Early to do that might cause resource waste, but later for that might causes problems such as anchor, unnecessary trailer and extra cost of maintenance Stable, Powerful Output Accurate Voltage output between 5.02V - 5.15V, far above Apple MFI standard, Dual USB, 3A large current full charge, no distinguish between intelligent dual USB,detects your device to deliver its fastest possible charge speed, compatible with all 5V USB-charged devices like iPad, iPhone, Samsung tab, smartphones, external battery, Bluetooth Speaker, headset all packed into a compact and portable design Worry-Free Warranty We believe in our products. That's why we back them all with 40-Day Money Back Guarantee, 18 Month Replacement Warranty for your Peace of Mind and provide friendly, easy-to-reach support For Optimal Useinput Voltage: Car model 12VUse your original cable or a third-party-certified one (such as MFi)We recommend charging your MacBook while it's turned off or in sleep mode
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