If you're seeking to avoid traps and toxins in your house, this guide will help you pick the very best ultrasonic insect repeller for your requirements. BEST OVERALL: Brison Pest Control Ultrasonic Repellent. BEST MOTION SENSOR: PETBROO Dog Cat Repellent. BEST SOLAR: T Box Mole Repellent. There are a lot of options to rid your house of rodents and pests, however only the very best ultrasonic bug repellers can do it humanely, Ultrasonic insect repellers keep vermin and bugs away without the hassle of standard baits and traps. Ultrasonic bug repellers are electronic devices that give off high-frequency sounds designed to fend off, hurt or kill family pests, such as rodents and pests.