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Thank you for your inquiry! The Biggest difference between the QuietComfort 25 and 35s is that the 35s are wireless Bluetooth headphones. The QC25's are wired. The QuietComfort 35 wireless headphones II are the most recent headphones in the QuietComfort product family. We hope this helps!
Sorry, there was a problem. Please try again later.The 25 uses a AAA battery and requires a wire to connect to your device. The 35 has a rechargeable internal battery and is wireless. I believe the 35 is the more recent version, but you might want to check with Bose.
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