Sennheiser HD 4.50 SE Wireless Noise Cancelling Headphones - Black : Electronics - Amazon.com
User manual Sennheiser HD 4.50BTNC (English - 37 pages)
Sennheiser HD 4.50 BTNC Wireless Headphone Review - Major HiFi
Pairing the headphones with a Bluetooth device
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User manual Sennheiser HD 4.50BTNC (English - 37 pages)
Professional Earpads Cushion Soft PU Leather Replacement Ear Pads for Sennheiser Wireless Headset HD 4.40 BT 4.50 400S Headphone