>>297167416
I'd spend the $20 on extra microusb usb cables and a 3-port usb wall charger, so you can charge the trackers without having to unplug the dongles.

I used to recommend some chinkshit magnetic microusb cables because they detach easily, but the tracker usb ports are so tight that the magnet will almost always shatter if you ever need to remove the magnetic plug. So don't get those.