The Conway Synchronised is a box camera, very similar to others in the Standard Cameras range. It differs in that it has connectors for a synchronised flashgun.

Internally, the flash circuit is closed by a small lever attached to the shutter touching some metal pins.

Externally, the flash sockets are two ~3mm push connectors, some 4cm apart. The official user manual hints that generic flashguns may be used but it specifically recommends the use of the Coro Flash (pictured below).

Conway Synchronised, with Coro Flash