The shell of our USB car charger is made from high-grade ABS materials, durable, anti-high and low temperature and flame-retardant. Owning dual USB charging port with total 4.2A output current (2.1A for each), it can charge two devices simultaneously at full speed, and can intelligently modify charged devices to reasonably distribute charging current. And built-in premium intelligent chip, it greatly ensures the security of your car and charged devices by preventing your car and charged devices from over-temperature, over-voltage, over-current, short circuit, over-load, and over-charge. Additionally, it comes with an IP65 waterproof cover to protect USB charging ports from water and dust and prolong its working lifetime.