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Although there are 5 LEDs on the front of the PA919PS only 3 lights function on this unit because there is only one receiver. The red LED indicates RF, the amber LED is for audio, and the green LED indicates power On. Full Wireless Operation As the transmitter on the PA919 and PA919SD is preset on channel 13, the receiver of the PA919PS is also set on 13. Any audio from the PA919SD can be transmitted to the PA919PS without wiring. There is no limit on the number of PA919PS speakers that can be u