Each base unit can connect 60 pes microphone unite, it has two way output in series (if add extend unite can
connect total 180 pes microphones) With limit switch to limit the quantity of microphones which can use at the same time.
You can choose "3" or "6".

Record output jack
Signal-to-Noise: 78db (1KHzTHD1%)
Rating Voltage: AC220V± 10%50Hz
Frequency Respond: 20Hz-20KHz
Size: 485*220*44mm (19" International standard rack)
Weight: 3.6Kg