From Ever-Dry: "The Ever-Dry™ hearing aid dryer fights moisture damage and loss of performance. The maintenance-free unit regenerates itself while your patients are wearing their hearing aids. Patients no loner need to struggle with baking or microwaving beads or sponges.  They do not have to purchase costly replacement bricks.  And, hearing devices are never exposed to any direct heat. Better performance means happier patients and more referrals."