Review on 🔌 Cllena Dual USB Socket Charger 2.1A&2.1A + LED Voltmeter + 12V Power Outlet + ON-Off Toggle Switch Panel for Car Boat Marine RV Truck Camper Vehicles GPS Mobiles (Blue) by James White

This affordable panel is a great modular solution for boats and vehicles where extra performance is needed. The switch can be connected first so that when it is off, it shuts off any parasitic current draw from the voltmeter or buck converter in the USB outlet. These round threaded connectors are interchangeable, allowing you to replace the cigarette lighter port with an additional USB port. Sockets or whatever else fits. I modified mine and put in an XT60 plug to charge the RC multicopter's batteries. The USB charger works well and after a few months of daily use I haven't had any problems with it. Looks good and is easy to assemble. There are no instructions on how to connect, but everything is quite simple. All negative terminals are gold/brass plated for easy identification.