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Ultrasonic electronic pest and insect repellent devices claim that their high frequency sound waves are intolerable to rodents and insects. However, simply plugging in one of these devices probably won't end your pest woes. It's important to understand exactly what these devices can do before investing in one

Metal phosphides have been used as a means of killing rodents and are considered single-dose fast acting rodenticides (death occurs commonly within 13 days after single bait ingestion). ... The acid in the digestive system of the rodent reacts with the phosphide to generate the toxic phosphine gas.

Once a rodent has consumed a lethal dose, it will die in 12 hours to 2 days. Additionally, once the rodent consumes a dose they will stop feeding which greatly reducing the risk of secondary poisoning.

1)Batrachotoxin- most potent non-peptide based poison known, gained fame though its use in poison darts made from frog excretions. 2)VX - One of the first chemical WMDs, researchers initially produced VX for retail sale in the 1950s as a pesticide. 3)2,3,7,8-Tetrachlorodibenzo-p-dioxin- 2,3,7,8-Tetrachlorodibenzo-p-dioxin was thecontaminantin Agent

We Can use:- 1) Moth balls as a Mouse Repellent. 2) Ammonia as an Effective Mouse Repellent. 3) Fabric Softener Sheets to Repel Mice. 4) Peppermint is another Natural Way to Repel Mice.