This is a vintage Belkin F1B024-E Data Transfer Switch, a manual A/B peripheral sharing box from the 1990s used to route parallel or serial computer signals between multiple devices.

Function: A manual rotary switch allowing a single computer or peripheral (like a printer) to toggle connections between two different devices (labeled here for PAN/HP and NEC).

Device has not been tested but appears to be in good condition. Please see photos from more details and thanks for looking!