An optical cable product to connect two INON strobes. A light receiving part is attached on front surface of a main strobe which is triggered by a camera signal to transmit main strobe's flash light to a sub strobe via optical fiber to fire the sub strobe simultaneously supporting reliable operation and free from synch problem even in bright area. The Optical D Slave Cable is useful to expand your lighting system even camera's optical connector is limited. ? Master Strobe (Main Strobe): INON Z-240, D-2000, D-2000S, D-2000W/Wn, D-180, D-180S, Z-220, Z-220F, Z-220S ? Slave Strobe (Sub strobe): INON S-2000, Z-240, D-2000, D-2000S, D-2000W/Wn, D-180, D-180S, Z-220F, Z-220S, Z-22(*2) (*1) This product is also attached on following diffusers for compatible master strobes and supplied "-0.5 Diffuser" / "-1.5 Diffuser" included in?Z-240?. The Z-240 shipped after July 2009 comes with -0.5 White Diffuser 2 only. Following compatible "diffusers" are available as optional accessory (*2)TTL operation (TTL slave) is available only for master strobe; [Z-220] / [Z-220F] / [Z-220S]. Optional [TTL Sensor Z] or [Focus Light Controller] is necessary to use the [Z-22] as a slave strobe.