ON/OFF Switch The switch can control the voltmeter & USB port at the same time. Save power and prevent the battery being drained when leave unused.
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Waterproof & Dustproof Water and dust resistance rubber USB cover, protects internal circuit, effectively enhance its lifespan.
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Red LED Digital Voltmeter Monitories the battery and electrical system automatically and indicating the voltage in the screen. You will know the health of battery while driving.
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