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【5V/4.2A Dual USB Car Charger】Dual USB charging ports with single output of 2.1 A enables you simultaneously chargers 2 devices at high speed. 【With safe power switch】Designed with On / Off switch for energy-saving and devices protection, expanding lifespan of devices. It conserves electricity and doesn't drain any power when switched off. 【LED voltage display】LED digital voltage monitoring function helps to monitors the health of your vehicle's battery and electrical system in real-time. 【High safety standards】Protects your devices from over-current. Built-in fuse for over-load, over-heat, over-voltage, under-voltage and short-circuit protection. Certified by RoHS, CE & FCC. 【Waterproof and heat resistant】Made of super Nylon materials with IP66 waterproof grade, the USB charger socket does well on high and low temperature environments ( - 40°F to 140°F). Ideal for car, RV, ATV, motorbike, boat and marine.