ReVIVE DV2 3.1A Dual USB Car Charger Diagnostic/Voltmeter Gauge With Battery &amp; Charging System Monitor for 12V-24V DC ， Smart Charge Technology ， LED Amperage &amp; Voltage Display with Visual Alarm Alert<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> CAR VOLTAGE METER &amp; USB CHARGER efficiently charges your mobile devices via your car’s DC outlet while also monitoring the health of your vehicle's battery and electrical system in real time </span></li><li><span class="a-list-item"> SMART CHARGING TECHNOLOGY optimizes charging speeds by communicating with your devices to ensure that the charging rate is not more than your device can handle - The DV2 won't overcharge your battery! </span></li><li><span class="a-list-item"> LED ILLUMINATED DUAL USB PORT DESIGN allows for simultaneous charging of two devices at once. With both 1A &amp; 2.1A ports， you can conveniently charge Smartphones (1A)， Tablets (2.1A) and other devices. </span></li><li><span class="a-list-item"> DIAGNOSTIC TOOL - A solid LED read out displays your car’s operating voltage or the total USB charging output while A flashing LED display indicates a potential vehicle voltage problem. </span></li><li><span class="a-list-item"> 3 YEAR MANUFACTURER'S WARRANTY - Tech Specs - DC input: 12V-24V / USB output: 5V 3.1A; 3.4A peak / Protection: Over current， overcharge， overheat， car voltage warning / 2.3" x 1.4" x 1.4" / 0.95 oz </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/4106PdmxySL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/4166m405AtL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41CvLIqr8zL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51n2QhBRI%2BL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/61fP3jCtTEL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51c7v9j2w2L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51ZW5K06I5L.jpg" noproxy>