The MCD-TXC is a 16 channel digital wireless transmitter designed with the latest 2.4GHz technology. It will control the MCD400R flash power settings in 1/10 f-stop increments and modeling lamp intensity in one f-stop increments. Control up to four groups of lights from a distance up to 250 feet away. The MCD-TXC has a standard camera hot shoe connector and comes with a 3.5mm jack for a PC cable and CR2032, 3-volt lithium coin battery.