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2. Connecting the headset to the battery pack
(except HMEC 352, HMEC 355 and HMEC 356)
The NoiseGard™ electronics of the HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and
HMDC 372 headsets can also be powered via the BP-04 battery pack (see
“Recommended accessories” on page 9). The battery pack can be operated either on
standard or rechargeable batteries (not included in the delivery). However, to ensure a
longer operating time, we would recommend using standard AA size alkaline
manganese batteries (IEC LR 6) or NiMH rechargeable batteries.
Inserting / replacing the the batteries
̈ Open the cover of the battery compartment.
̈ Insert four AA size alkaline-manganese batteries (IEC LR 6). Observe correct polarity
when inserting the batteries.
̈ Close the cover of the battery compartment.
LED operation and battery status indication
The battery pack has two control LEDs.
Yellow LED: The battery pack is turned on and the battery capacity is sufficient.
Red LED: The batteries are low. Replace the batteries.