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The in-use light does not work without a battery. With battery, red light will flash when another phone on the line is in use.
Sorry, there was a problem. Please try again later.Don't know if it works without battery; I always have batteries installed. With batteries, the light does come on when another phone in the house is in use.
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Sorry, there was a problem. Please try again later.needs the battery to light and it does blink when another phone on the line is in use
Sorry, there was a problem. Please try again later.The light is excellent and the light comes on when another phone is in use.
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