Sennheiser NOISEGARD HMEC 305 - Manual (Page 12)

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Powering options
There are three options for powering the NoiseGard™ active noise compensation:
1. Connection to the on-board system (12–35 V DC)
2. Connection to the BP-03 battery pack
(accessory, except for HMEC 302, HMEC 305 and HMEC 306)
3. Connection to the cigarette ligther socket (12–35 V DC) via adapter cable
(accessory, except for HMEC 302, HMEC 305 and HMEC 306)
The supply voltage for the NoiseGard™ system is processed by the in-line electronics in
the connecting cable.