CO-SS02B Studiosignalbox (also named cough-box) is made to be placed on the table in the studio. It has three functions:

1. Earthing the cough-relay in the CO-SCC103 to mute the microphones.
2. ON AIR light. (Red-light to show when any microphone in the studio is on air.)
3. Set off the buzzer in the controlroom to get the attention of the operator.