Spectrum Brands TELEMATRIX SP-400 - Manual (Page 29)

In-Use Indicators
In-use indicator lights located above each key indicate in-use operations.
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Speaker Line Indicators
When the “SPEAKER” key is activated,
the in-use light illuminates steadily RED
above the “SPEAKER” key.
Headset Key Indicators
When the “HEADSET ON/OFF” key is
activated, the Headset indicator will be
steadily RED.
Hold Key Indicators
When the “HOLD” key is activated, the
light above the HOLD KEY will be
steadily RED.