Vange Guitar humidifier safely releases moisture in sound hole in dry conditions. 
Drop the water into the hole in the top or soak the sponge in the water, no any leaks, easy to use. 
It can release moisture evenly and slowly inside your guitar to maintain the proper humidity level. 
The guitar humidifier suspended by the strings that it will never touch the body of guitar. 
A very good maintenance tool for your guitar and ukulele; To get the perfect guitar humidity and guitar sound.