Sennheiser 502399 Instruction Manual download pdf (Page 14)

The operating time with batteries/rechargeable batteries

is approx. 60 hours.

With NoiseGard™ switched on (see page 10), the LED 

provides information on the remaining battery/

rechargeable battery capacity.

LED  lights up yellow: The battery capacity is

sufficient.

LED  lights up red: The batteries are flat.

Replace the batteries.

Activating the “auto shut-off” function

The battery-saving “auto shut-off” function automatical-

ly switches the NoiseGard™ electronics off when the

headset is disconnected from the audio system or when

the aircraft avionics are switched off. The headset is de-

livered ex-works with the function deactivated. You can

activate “auto shut-off” as follows:

왘 Set the switch to the position ASO.

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Sennheiser 502399 Instruction Manual Page 14