According to the invention, the body of the ventilator defines at least one housing behind the front face of the ventilator, said housing communicating with the vent tube by means of one or more openings. The rubber-containing particles are mixed with a fatty acid-containing material in a friction mixer to produce a rubber-containing particulate mixture. The pillow has a removable cover that may, in preferred embodiments, incorporate a pleasant design and verses of Biblical scripture. Since the load impedance is generated without resistance, the manufacturing cost and the product size can be reduced. In one aspect, the communication device is a push-to-talk device.