Yes, I use this router in my remote cabin with 12 volts, I don't know the exact size of the plug, but it is the most commonly used plug. However, it is important that the plug is fused (small glass fuse) and not connected directly to the car battery.
According to my information, this device reaches up to the following speed values:
Download: 150 Mbit/s
Upload: 50 Mbit/s
Of course, this depends on the SIM card package that you take out with your network provider.
In terms of reception, the device should generally have a more stable and better reception than a smartphone.