Ultrasonic Pest Repeller

This is one of the better and more popular brands. It emits bursts of pulses at different frequencies. I did not find any spider webs inside this unit:

Here is a higher end version of the same thing, with a few extra user selectable settings to allow audible as well as ultrasonic output so it can be more effective against animals:

And a cheapo one that runs directly off the AC line:

Safety, accuracy and completeness of information provided herein is not guaranteed,
so be inspired by it but do not use it as a basis for experimentation or other actions.

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