Moisture is the enemy of all hearing aids!
Dampness, humidity, and body moisture reduce their sensitivity, shorten battery life, and cause corrosion. Where moisture conditions are excessive, the sensitive microphone and receiver may even become inoperable.
Before retiring for the evening, place hearing aid inside jar on top of foam pad and close cover securely. Pellets start working immediately to remove harmful moisture from hearing aid. Remove aid next day when ready to use.
For travelling, consider the compact size of the Mini Super Dri-Aid.