Palmer PPB20S Stereo Press Box - active distribution system, 2 inputs, 20 outputs with transformers. (A press patch box is an audio signal distributor intended for use at press conferences.) Separate inputs for microphone and 2x line signals, signal monitoring via 10-segment LED strip (-40 to +10dB), designed for use with 8-200W headphones, transformer balanced XLR outputs. Dimensions: 19"/3U. 5-year warranty.