Sennheiser - Bring your PXC 550-II to the next level with the latest firmware update (1.6.2). Aside from battery improvement and pairing enhancements, it makes your listening experience even smoother. 📸: @stevekouta
Review: Sennheiser PXC 550 | The Master Switch
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audio devices: Sennheiser PXC 550-II: Impressive battery and good ANC - The Economic Times
Sennheiser PXC 550-II review: Great sound and ANC - SoundGuys
Sennheiser PXC 550 Wireless review: Say no to noise, say yes to music | Expert Reviews