Hosiden Besson TEST TELEPHONE 290 Manual page 3

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Loop disconnect and DTMF dialling.
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Last Number Redial and 10 memory stores.
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Memory support battery.
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High impedance monitor.
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Line Disconnect.
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Line polarity indication.
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Audible ringing indication.
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Microphone mute.
FEATURES
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Earth Recall and Timed Break Recall.
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Resistance to "raw" 50 volt supply application.
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Ergonomic design.
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Rugged construction, moulded in high impact
material.
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Water resistant.
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Hanging loop and Belt clip.
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Conforms to BS6301, BS6305, BS6317, BS2011.