Just wanted to update that I got this in the mail today. Not bad—6 days from order to delivery, all for just over a dollar. I haven’t tried to hack it at all yet. Here are photos: https://imgur.com/a/J7S8rEW
I got the one that’s white with a bit of red near/under the cap.
One other thing that took me a bit to figure out: after removing the cap, the entire back of the device slides off (kind of like a battery cover in a remote) and there is a spot to put a SIM card beneath. Supposedly this does GPS too but I haven’t figured out how yet.