Put any shoe-mount flash in this device's hot shoe, and that flash will fire when the PC male cord(attached to the body of the device) is inserted into a camera's PC socket and you activate the camera's shutter.

The bottom of this device has both a flash shoe track, so that it can be inserted in other flash shoes, and a 1/4"-20 threaded tripod socket, so that it could be placed upon a tripod, table top tripod, clamp or any other device with a 1/4"-20 threaded screw.