USB Car Charger Rocketek 4 port USB Car Charger Adapter with Built-in LED Power Meter and rapid charger IC Car Adapter &ndash; Black [4.8A/24W] Automatic stops charging when there is danger of overcharging or lower/over voltage. Without interference to Radio, Bluetooth or WiFi; Made from fire proof materials for your safety. Charges your tablet and mobile phone simultaneously at full speed with Rocketek DC12-24V, 4.8A Rapid usb car charger Monitoring your Car Battery by the LED meter any time, please charge or change your car Battery when the Voltage&lt;12V. Vibration reliability for durable and the secure transfer of continuous power to your device from the cigarette lighter plug.