McLELLAND UBM-2222A Control Mixer is designed as a 3-channel audio mixer which allowing to control 3 audio input sources in the commercial Public Address and Paging audio systems. The UBM-2222A accepts and mixes 3 inputs from the Pair A, B and C of other CSP products. A detachable terminal block allows the INPUT to be connected directly to pair C. The signal may be Balanced or Unbalanced and microphone or Line level. Outputs are by way of single Balanced terminal block connector, or two Mono Unbalanced RCA connectors.The Audio Detect Outputs come with a LED that detects output signal, as well as provides trigger outputs that automatically turn on/off compatible audio equipment, in order to maximize the efficiency of energy saving and expand the life span of the connected audio equipment.