There are a couple options you have to dehumidify and this uses the time-honored method of using crystals to absorb moisture. This is simple and effective not requiring an electrical connection. That's why you always see those tiny silca packs when you unbox expensive electronic/metal items, as manufacturers add them in to preserve the products for years of shelf life. I don't care for the plug-in rods even with an outlet in my safe. They heat up the air inside to reduce humidity, so every time you open the door, the warm air goes out. Plus I wonder about cheap rods shorting out and starting an electric fire inside, extremely rare but possible. The crystals are enclosed in a nice red casing with a small viewing window (this should be much bigger) to monitor color changes from blue to pink. After turning pink, you take the unit out and plug it into a socket to recharge the crystals back to blue. Trouble is the crystals are originally bluish red and even a 12 hour recharge didn't change the color, so when do you know exactly they are completely dry? Also they should be replaceable, but Hornady does not give that feature as it is more profitable to have you keep buying new units. The small screws on the back should disassemble it, but I haven't tried that yet. You can buy just the crystals in bulk to save money that way. It's probably a good idea just to recharge the unit monthly to ensure dry crystals. But for the money, this is a pretty good way to go as it is small and can be wall mounted not taking up valuable shelf space.

Good product. Product performed advertised.

I haven't had them long enough to see how much they are working but I will keep you updated if anything happens

Works great. Easy view indicator for when crystals are saturated. Just plug it in to dry out to a deep blue and it’s ready to go again. Cool little gadget.