Sennheiser MX W1 Instruction Manual page 10

Plug the country adaptor into a wall socket.
The batteries are being charged. The corresponding LEDs
light up.
Charge the rechargeable batteries until the LEDs go off
(approx. 2 hours).
Note:
– The transmitter has its own built-in rechargeable battery.
So it will not drain your audio device's battery.
– With a fully charged rechargeable battery, the operating
time of the transmitter is approx. 10 hours and of the
earphones approx. 3 hours.
Charging the earphones on the move
When on the move, the earphones can be charged up to three
times in the docking station, without the docking station having
to be connected to the mains.
Insert the earphones into the charging compartments
the docking station. Make sure that the earphones are
inserted correctly.
Press the charging button
The rechargeable batteries are being charged. The LEDs
and light up.
Charge the rechargeable batteries until the LEDs go off.
8
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to start charging.
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