Sennheiser IS410 - Meaning of the Leds and Acoustic Signals; Leds on the Transmitter; Acoustic Signals of the Receiver

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Meaning of the LEDs and acoustic signals
LEDs on the transmitter
Acoustic signals of the receiver
LED Status Meaning
Operation indication  lit green The transmitter is switched on.
The receiver is not stored in the
charging compartment .
off The transmitter is switched off.
The receiver is stored in the
charging compartment .
Charging control LED of
spare rechargeable
battery 
Charging control LED of
receiver rechargeable
battery 
lit red Spare rechargeable battery or
rechargeable battery is being
charged
lit green Spare rechargeable battery or
rechargeable battery is fully
charged
“Speech intelligibility”
button 
lit yellow Speech enhancement is activated
Acoustic signal Meaning Commentary
6 short beeps No audio signal
(transmitter is not
activated or out of
range)
Automatic switch-off after
approx. 3 minutes
2 long beeps Rechargeable battery is
flat
Automatic switch-off after
approx. 3 minutes