The Oasis OH-14 Case Plus+ Humidifier uses the same evaporative membrane as the OH-5 Plus+ Humidifier, providing 50% more daily humidity than either the OH-6 Case Humidifier or the OH-1 Guitar Humidifier. This humidifier is designed for use in drier climates (desert, mountain or frigid north) where the relative humidity is below 25%. The OH-14 Case Plus+ Humidifier, like the OH-6 Case Humidifier, attaches to the inside of your instrument case. To accomplish this, two powerful neodymium magnets are inserted in the seam of the humidifier. The magnets attach to either a steel clip or a stainless steel strip with adhesive backing (both are provided with the humidifier). The steel clip fits over the side of your case, providing a flat vertical surface to which the magnets can adhere. The neodymium magnets are strong enough to keep the humidifier attached to the clip or strip, but still allow the user to remove the humidifier with ease.The OH-14 Case Plus+ humidifier can be used to humidify the headstock of a guitar by attaching the clip over the backside of the case. The humidifier can also be used in stringed instrument cases such as violin, viola or cello by attaching the stainless steel strip to the inside of the instrument case with the double sided tape. The steel clip and strip give the user a wide variety of ways to attach the humidifier to the case. Like all of our humidifiers, we provide a 10 cc syringe for distilled water filling control.Because tap and bottled water have dissolved minerals that can clog the liner, distilled water is recommended to extend the useful life of your humidifier.