The precise model of pager is the Motorola Advisor, which has the dimensions of 81mm by 55mm by 18.5mm thick.
This guy researched building a replica: https://famicoman.com/2018/11/06/building-a-replica-hackers-pager/
It essentially consists of a yes button, a no button, and a four-directional toggle that lets users sift through a lot of separate pieces of information. Perfect for our use!
Hi! I working on a robotics project... Check it out! Do drop a like too :P