Review on LiDiVi [Upgraded Version] Dual USB Car Charger with Quick Charge 3.0, Waterproof 36W 12V USB Outlet - Fast Charging, Voltmeter & Switch for Car, Boat, Marine, ATV, Truck, and More by Rob Madden

The dual port USB charger works great and charges my Samsung Galaxy s20 Ultra very quickly. The voltmeter is easy to read and appears to be working properly. I am very happy with it and would buy one again for my next bike at any time. I was a bit worried about the on/off button when I bought it, but it also works exactly as you would expect. Therefore, I did not even start installing a separate relay, but connected it directly to the battery. I just have to make sure I manually disconnect the charger when I turn off the engine. This is pretty easy as the blue voltmeter stays on after the engine shuts off, reminding me to turn off the charger.