Sennheiser PXC 550-II Instruction Manual page 7

Active noise cancellation (ANC) switch
position: off "0", USER mode "I", MAX mode "II"
Voice assistant button
pressing for 4 seconds activates the Bluetooth pairing
mode
LED
Input for USB micro-B;
for charging and music playback/data connection
Input for analog audio cable;
when a cable is connected, flight mode is activated/Blue-
tooth is deactivated
Overview of the LED display
During operation
LED
flashes white
3x
3x
flashes white
3x
3x
flashes red 3x
3x
flashes red 3x
3x
flashes white
sequentially
flashes red
During phone calls
LED
flashes white
3x
3x
flashes red 3x
3x
During charging
LED
1 red
1 white
2 white
3 white
Meaning; the headphones...
... switch on
... are connected to a device via Blue-
tooth
... switch off
... are not connected to a device via
Bluetooth or the connection has been
lost
... are in Bluetooth pairing mode
A charging error/battery error has
occurred (> 33)
Meaning
Incoming call
Incoming call and the rechargeable
battery of
the headphones is almost empty
Meaning
Rechargeable battery is almost empty
(less than 2% charged)
Battery is approx. 2-20% charged
Battery is approx. 20-40% charged
Battery is approx. 40-60% charged
Product overview
PXC 550-II | 7