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RTS' SPK-300L A5F is a 2-channel select portable speaker user station. It can be used as a "public" listen box via built-in speaker or privately through the headset connection. Features channel select switch, call light, speaker on/off switch and dual-purpose portable desktop volume control. Packaged in a rugged all-metal housing perfect for table-top operation. The SPK-300L comes with a hand-held microphone.