Raymarine RAY 210VHF - Manual (Page 14)

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7) Large speaker cavity designed to provide superior audio quality.
8) Selected channel number indicated on the LCD digital display.
9) "Quick" channel 16 or 9 key to instantly switch to emergency channel 16/9.
10) Full 25 watts RF output power to the antenna port with protective circuitry
to prevent damage to the radio if operating into a faulty antenna system.