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Using this product as a freezer door open alarm. Wired up to an old 12 volt DC output phone charger, old Nokia one I think, through a magnetic reed switch attached to the freezer door. When door is open the lights flash and stop when the door is closed. Easy to set up. Second one that I have installed. First one certainly saved the freezer contents more than once. No mistaking if the door is not fully closed. Hard to miss those flashing lights.
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
Works well
Verified purchase: Yes | Condition: New