▁controlled ▁using ▁a ▁mix ▁of ▁buttons ▁and ▁touch - sens itive ▁areas ▁on ▁the ▁cu ps . ▁Un like ▁the ▁Q C ▁ 3 5 , ▁they ▁do ▁not ▁fol d ▁in ▁half , ▁but ▁their ▁ear cu ps ▁can ▁rotate ▁for ▁storage . ▁The ▁embedded ▁re charge able ▁battery ▁is ▁not ▁replace able ▁which ▁limits ▁the ▁lif es pan ▁of ▁the ▁head ph ones ▁to ▁the ▁life ▁of ▁the ▁battery . ▁B ose ▁promoted ▁improvements ▁to ▁sound ▁quality , ▁noise ▁can cellation ▁and ▁voice ▁call ▁quality ▁over ▁the ▁Q C ▁ 3 5 . ▁The ▁N CH 7 0 0 ▁can ▁also ▁connect ▁to ▁two ▁devices ▁simultaneously , ▁and ▁integrate ▁with ▁Amazon ▁Alex a ▁and ▁Si ri ▁in ▁addition ▁to ▁the ▁Google ▁Ass istant . ▁ ▁In - ear ▁head ph ones ▁ ▁Qu iet Com fort ▁ 2 0 ▁ ▁The ▁" Q ui et Com fort ▁ 2 0 " ▁( Q C 2 0 ) ▁and ▁Q C 2 0 i ▁in - ear ▁head ph ones ▁were ▁released ▁in ▁ 2 0 1 5 ▁and ▁are ▁the ▁company ' s ▁first ▁in - ear ▁noise ▁can cell ing ▁head ph ones . ▁The ▁Q C 2 0 ▁model ▁is ▁for ▁Android , ▁Windows ▁and ▁Black berry ▁devices , ▁while ▁the ▁Q C 2 0 i ▁is ▁designed ▁for ▁Apple ▁devices ▁and ▁includes ▁volume ▁controls ▁on ▁the ▁remote . ▁ ▁The ▁noise - can cell ing ▁hardware ▁and ▁re charg able ▁battery ▁is ▁contained ▁with ▁a ▁box ▁located ▁near