Kyser guitar humidifier is easily installed and removed from the soundhole, lifeguard humidifiers regulate the humidity inside the instrument.  The humidifier absorbs excessive moisture in damp conditions, and humidifies in dry conditions.  Acoustic size fits 3 3/4" - 4 1/8" sound holes and classical size fits 3 3/8" - 3 3/4" sound holes.

Read our Humidity blog to learn more.