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Why do you need to purchase a charger with car battery voltage warning? Voltage is too low: Car will difficult to start, won't catch fire,intermittent dead fire, insufficient lighting lights etc. Voltage is too high: Causes abnormal signal of the shift solenoid valve, engine instability, speaker does not ring and other issues. Car battery voltage monitoring feature that allows you always grasp the battery state of health, prolong car battery life. How to use it : 1.Plus this car charging into car cigarette lighter hole, it will detects the car battery voltage automatically and shows on the screen, and please kindly noted. For 12V car, when the voltage is under 11.5V or higher than 14.9V, the dispaly while shinning to remind driver your car with battery issue. For 24V car, when the voltage is under 23.1V or higher than 27.3V, the dispaly while shinning to remind driver your car with battery issue. If you car battery has some voltage problem, as the smart car charger detected, you had to find professional car care shop to examine your car battery to make sure it works well. 2.Connect your device to the car charger by suitable cable, the screen of car charger will shows charging voltage 5V and then shows the charging current (3.1A is max current for this item).This car charger will identify your devices and input a suitable charging current to make sure the charging won't bring a damage to your devices. 3.The input current will decrease until your devices battery is full, then the display will switch back to voltage display. Product Features Size (LWH): 2.08 x 1.3 x1.3 inches Weight: 0.8 ounces Display the voltage of Car Battery Display the charging current while charging Input voltage: 12-24V,Output voltage/current: 5V DC/3.1A Smart IC to detect your devices and input correct charging current.