The RE121D is a 12 channel rack mount dimmer with a capacity of 1,200 watts per channel giving a total of 14,400 watts. It is suitable for church, stage, theater, disco, night club, live performances and other event and artistic applications. The RE121D is controlled by a lighting control console. The unit uses the DMX-512 control protocol. Channels A - F and/or channels G - L may be switched to operate in "relay" mode. In relay mode, channels may be switched only to either to full on or full off depending on fader position.