The metal thing looks like an ibutton / 1-wire reader, which matches the functional description given: https://www.atrack.com.tw/en/product/1-wire-ibutton-tag-

The metal thing looks like an ibutton / 1-wire reader, which matches the functional description given: https://www.atrack.com.tw/en/product/1-wire-ibutton-tag-reader https://www.atrack.com.tw/en/product/1-wire-ibutton-tag-read... If you have a flipper zero, maybe you could poke at it.