A device to facilitate a user interface of a computer system utilizing breath includes a body, a user side inlet defined by the body to receive a fluid flow generated by a user, an exhaust opening defined by the body, a conduit positioned between the user side inlet and the one exhaust opening, at least one segment positioned inside the body and one or more contactors positioned to be intermittently in contact with the at least one segment. The contact may occur responsive to the fluid flow generated by the user. The device may include a sensor to react to a movement of the at least one segment.