This is a Battenfeld known as the Golden Rod, model 725721.
The Golden Rod Dehumidifier works by slightly increasing the air temperature inside the gun safe or other enclosure. This allows the warm air to circulate throughout the safe on a continual basis" thus eliminating humidity" mildew" and condensation. All of which are dangerous to your expensive firearm collection.
Features:
Removes Moisture from Gun Safe
Prevents Rust
Mounting Brackets Included