I was wondering if it's possible to create an untraceable device if it doesn't use internet, bluetooth or anything like that?

Suppose I'm a threat to all humanity and catching me is top priority of all countries. If I hide in some random location, in some part of the ocean, in woods, deserts, so on. If I had som sort of device, say just something for games to pass time, would that be trackable?

I'm sure the older gameboys are not traceable (am I wrong?). But I was wondering what in a device makes it traceable? GPS works even when I don't have internet so if I make a device with no internet but with GPS, I would still be tracked (am I wrong?). Bluetooth I think is harder since it's short range, but I assume a device can be made to track some of its waves?

Question: What is it that would make a device traceable at all?

I can also imagine that if they put their minds to it, they can create a device that would detect electricity in some way and so if my device only has the electricity, it would still be traceable but that is a little too much so I'm mainly asking about the other stuff.

I ask this because I'm curious about if I'd be able to make some sort of message encryption device back in WW1 that would be impossible to decipher.

Hello guys,

I wanted to get the opinions of people I deem smarter than me. With the direction in which the US economy is going, does it look like crypto will start looking more and more attractive for the everyday person seeking to invest ? With interest rates lowering over the next 2Qs would people be more likely to take out lones at low interest to then take the risk at making higher returns in crypto ?

Please let me know what you all think and of course this is mostly speculation.