The Hensel RC Sender/RF-C Four Channel Radio Slave Transmitter with monoplug combines radio triggering, model light activation, and flash power control into one single compact device (with Hensel strobes that support this these features).
The availability of four channels prevents interference between different work groups within the same studio. On channel #4 (master channel) all devices can be controlled simultaneously, regardless of the channel they are set to.
The transmitter is small, light and easily mounts into a hot shoe.