AudioStation 4 - FAQs
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Wireless - Transmitter & Receiver Power Adapter Specs 
Receiver Plug in Power Supply Model PR30A
    Input 120V 60Hz, 18W.
    Output 12VDC 400mA max.
    Plug tip is +

Transmitter Plug in Power Supply Model PT30A   
    Input 120V 60Hz, 5W
    Output 12VDC 200mA max.
    Plug tip is +
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