PHONE CHARGER WITH USB DISPLAY SHOWING VOLTAGE AND CURRENT 12-24V

When connected to the cigarette lighter, the display shows the current voltage in the vehicle installation (4V ~ 30V range). When a device is connected for charging (e.g. phone or navigation), the display briefly shows the device's battery charging voltage (about 5V) and then automatically switches to the battery charging current display mode (max. 2.1 A).