Simply soak in water and slip the flexible tube (color may vary) through the F-hole of your instrument. It is easy to monitor with the included humidity indicator card! Why use a humidifier? The winter months ahead will bring with them colder and drier air which can also be dangerous for instruments and bows. Wood absorbs and releases moisture as humidity levels change within the surrounding air. Instruments are, of course, made of wood. Dry air causes wood to release moisture which causes it to shrink and/or shift ever so relatively which to your instrument can result in cracks and expensive repair bills. Of course most instruments is not going to crack, but as your instrument dries out, its tone will change, and seldom does it change for the better! Bow horsehair shrinks in dry air which can impair sound quality, or cause the bow to warp, or could even result in a disastrous bow tip break. A good phrase that comes to mind is: “An ounce of prevention is worth a pound of cure.” Purchasing a rather affordable humidifier will offer protection to your investment and you to sound your best.