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Charging the headphones' rechargeable battery
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misodiko Upgraded Earpads Replacement for Sennheiser HD 4.50BTNC/ 4.50SE/ 4.50BT/ 4.40BT/ 4.30G/ 4.20S Headphones|Earphone Accessories| - AliExpress
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Sennheiser HD 4.50 BTNC Review. A layman's perspective on audio… | by Akshay Zade | Medium
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