Listen Technologies LA-317 - Manual (Page 39)

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Information
LED Indicators
Portable Receivers (LR-300, LR-400, LR-500)
Red LED
Continuous ON Unit is operating
Slow flash Batteries are low
Slow flash while charging Charging in progress
Portable Transmitters (LT-700)
Red LED
Continuous ON Unit is operating
Slow flash Batteries are low
Slow flash while charging Charging in progress
Fast flash Audio mute is active
Charging/Carrying Cases (LA-311, LA-317, LA-321, LA-323, LA-324, LA-325)
Green LED
Continuous ON Power to case
Continuous OFF No power to case