No need to take the Kids HearMuffs Trio on and off each time you want to communicate with your child. Simply press a button for Conversation mode to speak with your child. Options include Protect Only and Conversation Mode allowing voices to be heard while compressing potentially harmful noises to comfortable levels. Kids Hearmuffs Trio can be used as headphones at any time and in any mode with its intuitive design featuring an external audio port. Simply connect an external device via the included 3.5 mm audio cord. No power or batteries required. Adjustable headband with smooth foam fits a wide variety of children's head sizes. And all HearMuffs are made with child safe materials and an industry-leading 22 Noise Reduction Rating (NRR).