The Lastolite Lumen 8 Radio Trigger can fire Lastolite Lumen 8 heads from the camera via a radio signal, removing the need for trailing sync cords. The set is suitable for both studio & location shoots. Specification: Type Wireless Radio controller Distance 12-15m indoors, 8-10m outdoors Connectivity Hot shoe 3 minute auto power-off to conserve batteries Fits camera hot shoe. Also comes with cable connection Transmitting interval 0.1 to 1 second.