Review on BlueFire Waterproof Dual USB Charger Socket with Cigarette Lighter, Clock, and Voltmeter - Ideal for Motorcycle Handlebars & Rear View Mirror by Chris Maurer

Great product. I plugged in one of my phones and left the screen on, turned on the floor lights and plugged the UA Mini Boom speaker into a second USB port (with music from the phone) and left it all in my garage for 2 days. I constantly monitored the battery with my tester. The voltage on the tester was always exactly the same as on the Bluefire device. It shows me how much stress my bike is gaining or losing. We have 2 units for 2 Vulcan 900. Very satisfied. Highly recommended. Thanks bluefire. . And no, I didn't burn enough amps to charge. The lighter even works and the watch will be on time in about a month.