Sennheiser ConC 400 Series Instruction Manual page 9

Product overview
If the LED display does not light up:
• Clean the contacts on the earbuds and in the charging case
(> 34).
• Charge the rechargeable batteries of the earbuds and the
charging case (at least 30 minutes) until the LED display
lights up again (> 14).
Overview of the LED indications of the
earbuds
The LEDs of the earbuds indicate the status of the Bluetooth connec-
tion:
LED
flashes blue
lights up blue for
5 seconds
When the earbuds are in the charging case, signals about the charge
status of the earbuds are displayed:
LED
lights up green
flashes green
flashes orange
quickly
lights up orange
for 5 seconds
lights up red
flashes red
slowly
flashes red
quickly
Notes on acoustic feedback
The earbuds play melodies during some events, e.g. when setting the
minimum or maximum volume.
Meaning; the earbuds...
... are in Bluetooth pairing mode (pair-
ing for Bluetooth and e.g. for the
Sennheiser TV Connector transmitter)
... pairing process successful
Meaning; the earbuds...
... earbuds are fully charged
... earbuds are being charged via the
rechargeable battery of the charging
case
... firmware is being updated
... firmware update successful
... charging error/battery error
... earbuds are being charged via the
rechargeable battery of the charging
case, charge status < 10 %
... rechargeable battery is almost
empty
ConC 400 | 9