Likeable little guy - Cannon Silica Gel Dehumidifier - 57 Cubic Feet

It may be incorrect that some think this is "rejuvenated" by using an electrical current. Not so. On the bottom it gives the appropriate oven temperature and runtime to reactivate the pink crystals back to blue, and I have learned this will function for about ten years. Good news. It is also rather effective in a closet where I store optics: a hygrometer there shows a drop of an average of 10%+ all the time, in the sweltering humidity we've had around here lately, with dew points at or just below the temperature. Good product. One might even consider getting a few extras...