Feature: 1. Hygrometer: Guitar soundhole humidifier comes with a hygrometer that monitors humidity levels to ensure your guitar stays within the health range. 2. Prevent Damage: This guitar humidifier helps prevent cracks, warping, and other types of damage caused by environment such as dryness or humidity. 3. Easy to Use: The guitar sound hole humidifier is simple to use, just soak the sponge in water, place it in the container, and then attach it to the guitar. Can be easily removed when not in use. 4. Compact and Portable: The classical guitar humidifier is compact and portable, easy to carry and go out. Can be used on guitars of all sizes. 5. Made of ABS Material: The guitar sound hole humidifier is made of ABS material with excellent workmanship and robust. Specification: Item Type: Guitar Soundhole Humidifier Material: ABS Package List: 1 x Guitar Soundhole Humidifier