Ultrasonic electronic pest repellents used to claim that they are 100% effective in ridding pests and insects. This, however, has been found to be untrue. Some of the ultrasonic electronic pest repellents did not work at all, and some have been shown to be very effective against a certain type of pest. Even though they are not a 100% effective, they could be added to your regimen to preventing unwanted pests and insects along with other preventive actions.
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