Keep Unwanted Sounds Out, and Privicy In! Over 40 years ago, Marpac developed the original Sound Screen® sound conditioner because the founder was having trouble sleeping. It worked so well, he made it available to his friends and family and ultimately the world. Today, the Sound Screen® is still the most economical, most popular sound conditioner on the market. Marpac combines American ingenuity and craftsmanship to create a lightweight, yet durable appliance capable of many years of reliable service. These sound conditioners create a consistent, smooth sound of rushing air. The tone and volume of the sound are controlled by simply rotating the "cap" and "collar" of the housing. This "white noise" sound effectively masks unwanted noises and creates a sense of calm, making it easier to concentrate, relax and/or sleep. These sound conditioners are recommended for restless sleepers, shift workers, infants, children, students, apartment dwellers, office workers (for confidentiality) and many others. We offer the dual speed 980 in a durable plastic housing suitable for travel or use in the home or office. When used properly the SoundScreen can help ensure privicy for conversations that demand it. Great for Doctors, psychologists, lawyers and other sensitive office environments where privicy is important or required. Features: Electro-Mechanical Durability Excellent Sound Quality Patented Housing Design This product is available with either the Sound Screen® or the Sleep Mate® brand name. Patented housing design Lightweight Economical Energy efficient Dual Speed One Year Limited Warranty Made in the U.S.A.