Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Desiccant blocks for hearing aid care

This product is one of the few things that works as advertised. With the high cost of hearing aids the price of these desiccant blocks is a tiny amount of money to insure the full lifetime use of your hearing aids. Used with the Global Dry Store machine has been very sucessful for the last four years that my wife has used these products. After checking prices we bought them on Amazon.com. Amazon was a lot cheaper than any where else. Remember you must remove the moisture from your hearing aids or they will fail.