D'Addario PW-HPRP-03 Humidipak System Replacement Packets, 3-pack & Extension Cables Power supply Microphone: 2 AA

Power supply Microphone: 2 AA size batteries

aesthetically discreet: column sound evolves to the next level

from high-stringing it to setting it up to play lap slide

I found this to be tremendously liberating

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D'Addario PW-HPRP-03 Humidipak System Replacement Packets, 3-pack & Extension Cables Power supply Microphone: 2 AA3 replacement packs for the D'Addario Humidipak system Automatic humidity control protects your instrument against warping, cracks and other damage cause by lack of humidification No more manual adjustments based on seasonal changes, geographic locations, temperature, or other factors Unlike refillable humidifiers Eliminates the guesswork and anxiety of maintaining your instruments proper humidity level