Falcon Eyes Slave Sensor PS-35 With 3,5 mm and 6,5 mm plug

when you experience trouble with the slave function of your flash unit (flashing along with other flash units), or when there is no slave function available on your studio flash unit, you can use this flash sensor. Your flash unit reacts along with your infra red transmitter or other flash units. It has an adapter so the plug is suitable for both the larger and the small sync-connections.