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Sennheiser HD 4.50 BTNC Owner's Manual

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HD 4.50BTNC 
| 9 
Product overview
Overview of the LED indications
LED indications during operation
LED
Meaning
The headphones switch on
Pairing/connecting with a device is successful
The headphones switch off
The headphones are disconnected from the 
device
The headphones are outside the 
Bluetooth 
range of the device
Pairing with a device is unsuccessful
1s
The headphones are in pairing mode
The device is successfully cleared from the 
headphones
NoiseGard is activated/deactivated  
(
Bluetooth connection)
2s
2s
The headphones are in idle mode (headphones 
are paired but not connected to the device)
NoiseGard is activated  
(audio cable connection with sufficient  
battery life)
LED indications during calls
LED
Meaning
Incoming call
Incoming call with an almost empty battery