▁ ▁Qu iet Com fort ▁ 2 5 ▁ ▁The ▁" Q ui et Com fort ▁ 2 5 " ▁( Q C 2 5 ) ▁over - ear ▁head ph ones ▁were ▁released ▁in ▁ 2 0 1 5 ▁as ▁the ▁replacement ▁for ▁the ▁. ▁Un like ▁its ▁prede cess ors , ▁the ▁Q C 2 5 s ▁can ▁be ▁used ▁( without ▁the ▁noise - can cell ing ▁function ) ▁while ▁the ▁battery ▁is ▁flat . ▁Another ▁change ▁is ▁the ▁elim ination ▁of ▁the ▁Hi / L ow ▁switch ▁which ▁increased ▁the ▁input ▁gain ▁for ▁low - output ▁sources ▁like ▁MP 3 ▁players . ▁ ▁In ▁ 2 0 1 4 , ▁the ▁Q C 2 5 s ▁won ▁the ▁What ▁Hi - Fi ? ▁Sound ▁and ▁V ision ▁annual ▁award ▁for ▁" Best ▁No ise ▁Can cell ing ▁Head ph ones ". ▁ ▁Qu iet Com fort ▁ 3 5 ▁▁ ▁The ▁Qu iet Com fort ▁ 3 5 ▁was ▁released ▁in ▁ 2 0 1 6 ▁as ▁a ▁successor ▁to ▁the ▁ 2 5 . ▁It ▁supports ▁Bl uetooth ▁wireless ▁operation , ▁the ▁B ose ▁Connect ▁mobile ▁app ▁for ▁advanced ▁audio ▁control , ▁and ▁contain ▁an ▁embedded ▁re charge able ▁battery . ▁▁ ▁In ▁ 2 0 1 7 , ▁B ose ▁released ▁an ▁updated ▁model ▁known ▁as ▁the ▁Qu iet Com fort ▁ 3 5 ▁II , ▁which ▁adds ▁a ▁custom izable ▁" action " ▁button ▁on ▁the ▁left ▁ear ▁cap . ▁By ▁default , ▁it ▁is ▁mapped