Just hang the Eva-Dry unit in a closet or in a small, enclosed space and the other will start to absorb damp. There is an indicator window with special "moisture meter crystals" that change from blue (when dry) to pink (when wet) to indicate when the unit needs to be updated. The unit will absorb approximately 8-10 oz. damp (depending on humidity levels this should take between 6-8 weeks). Once the damp has been absorbed, can not leak or spill.
This product uses a specially engineered, crystallized silica gel that is odorless, non-toxic, and completely safe. When the indicator crystals turn pink, it's time to renew the unit. Remove the Eva-dry unit from the area where it absorbs moisture and plug it into a power outlet in a well ventilated area. A built-in heater warms the crystals, allowing them to expand and release damp vapor into the outside air. It takes times about 12-14 hours, to completely renew the unit. When the light indicator crystals change from pink to blue, the unit is ready to absorb another 8-10 oz. humidity. The crystals remain active for 10 yrs. and the unit includes a 5-yr manufacturer limited warranty on all DEV500 product..
The 4-pack E-500 that will be used in my closet which is located in the Master bathroom (many new houses now have a design, which makes cabinets that will be exposed to a large number of daily moisture). Cabinets are approximately 10 meters x 6 meters. I need to protect my clothes and bags from moisture. I put 2 of them on the inside. I do not see the color change in cyrstals until week 3. I can see cyrstals increase in size and color has changed to clear / pale pink now. This product seems to be working, and it was clean, comfortable! Way better than where you buy you have to replace the white powder / crystal, and requires you to drain the water from time to time. But this product elimates these hassles. I bought 4 so that when the two need to be updated, I always have a set to use. Would recommend it to people I knew.