| 31. | Battery-operated units should have an indicator light to show when the battery is weak.
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| 32. | The ILS has a Medium Intensity Approach Lighting System, with Runway Alignment Indicator Lights.
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| 33. | Brake pad wear warning via an instrument panel indicator light was a notable innovation.
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| 34. | John Edwards'plane takeoff was aborted because of an indicator light.
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| 35. | When the note is in tune a green " in tune " indicator light illuminates.
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| 36. | They're enclosed in a plastic case and have indicator lights that monitor your online connection.
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| 37. | Many cheap ones only have a single indicator light.
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| 38. | An LED indicator lights when the trimmer is charging.
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| 39. | The ammeter was replaced by a charging indicator light.
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| 40. | External models also sport small indicator lights that tell the user the modem is working.
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