This 2U rack-mount unit includes 12 cue light channels, plus two global push buttons for “All Selected Channels Go” and “Clear.” Each cue light channel has push buttons for ATTN (attention) and GO, with a bi-color status LED that illuminates red in ATTN mode and green in GO mode. The presence of a connected TS 10 receiver is detected automatically; if no receiver is present, the channel is ignored by the TS 120. The auto-select power supply may be connected to voltages from 100 – 240 V at 50 or 60 Hz.