... off after ten seconds to conserve battery power when no power needs are detected. h).Battery level ... vice versaLED indicatorsStatusLoad level/battery level, battery , utility power, inverter, bypass, overload, faultAudible alarmBypass, on battery ... mode, battery low, overload, faultAcoustic noiseAt 1 meter distance45 dB50 dBCommunicationDB-9 portRS-232 serial interfaceIntelligent slotOptions ...