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This Sonia Extended Range version has approximately 25% increased range over the standard Sonia optical slave (yellow end cap).

This optical slave will work with most flash units but it will NOT work with the Canon EX flash units.

You must have a cord to connect this optical slave to your flash unit. Many flash units come with a PC cord that will connect to this optical slave.

This device will immediately fire a connected flash unit when another flash burst is detected. This allows a remote flash to be fired without any connecting wires.

It requires no batteries or other power; it runs off the flash unit it is connected to.

It works with both small, battery-powered flash units and studio flash units.

The connector on the optical slave is a female PC connector.

The triggering flash must not emit a pre-flash as this will prematurely fire the connected flash.

It is small, about ½ x ¾ x 1 inches. The slave and circuitry is encased in solid resin, so it is extremely rugged.