Charger Dual USB Car Charger 5V/4.2A Two USB charging ports with a single 2.1A output allow you to charge 2 devices simultaneously at high speed. Protection 10A Fuse Protection, Built-in 10A fuse protects your devices from overheating, overcurrent, overvoltage, overvoltage, undervoltage and short circuit. Wide Application fit Universally suitable for car powered vehicles, boats and RVs, motorcycle, truck, SUV, UTV, etc. and you can also use the connectors we offer for higher charging capacity. Easy Installation, The hole diameter is 3cm. "+" to the positive pole, "-" to the negative pole. A cap protects the USB ports when not in use. In addition, it can be wired to an on/off switch, then you can turn it off if it is off to save energy. Waterproof and heat-resistant, With a waterproof cover and does a good job in high temperature and low temperature environments (-20 ° C to 60 ° C), durable hard flame-resistant, resistant to strong current, high temperature and wear. Number of pieces