Using Noisegard - Sennheiser HD 4.50BTNC, HD 4.50R Instruction Manual

Using the headphones

Using NoiseGard

The HD 4.50BTNC/HD 4.50R Wireless headphones provides excellent attenuation
of ambient noise using the NoiseGard Active Noise Cancellation technology.
You can activate or deactivate NoiseGard if your headphones are connected to
the smartphone using Bluetooth or the audio cable.
Activating/deactivating NoiseGard when connected via Bluetooth
Simultaneously press and hold the Volume
X
The LED flashes purple 3 times. NoiseGard toggles between on and off.
Activating/deactivating NoiseGard when the audio cable is used
Press the power button.
X
NoiseGard toggles between on and off. The LED lights up blue to indicate that
NoiseGard is active.
+/- buttons.
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