Feature:1. Prevents Dryness: Guitar humidifier precisely humidifies your guitar to ensure your guitar from dry weather and prevent shrinkage or cracking.2. 2 in 1 Design: Guitar humidifier with accuracy indicator needle hygrometer, environmentally friendly, no batteries in real time, humidification and testing at the same time.3. Plastic Material: The shell of this guitar humidifier is made of plastic, lightweight and wear resistant, smooth and burr free.4. Compact Size: This guitar humidifier is easy to install and carry, clips onto the guitar without moving the strings, easy to maintain.5. Applicable Type: The guitar humidifier is suitable for folk guitar, classical guitar, all acoustic guitars, with a wide range of applications.Specification:Item Type: Acoustic Guitar Humidifier HygrometerMaterial: PlasticSize: Approx. 8.7 x 5.37 x 3.95cm / 3.4 x 2.1 x 1.6in.Package List:1 x Acoustic Guitar Humidifier Hygrometer1 x Water Filling Bottle