Do ultrasonic mouse and rat repellers work?
Updated 22 October 2026 · By the MintGuard team
Quick answer
Results from ultrasonic repellers are mixed. High-frequency sound doesn't pass through walls, furniture or cupboard doors, and many users report rodents get used to it. They also need a socket, which rules out lofts, sheds and cars.
Plug-in repellers are popular because they're easy. Here's what to know before you buy one.
How ultrasonic repellers work
They emit high-pitched sound above human hearing, intended to make rodents uncomfortable. Electromagnetic versions claim to use house wiring instead.
Their limits
- Sound is blocked by walls, furniture and cupboard doors, so it only reaches open parts of a room
- Rodents may get used to a constant noise
- They need a power socket, so they can't cover lofts, sheds, garages without power or car engine bays
- Some pets, including rabbits, guinea pigs and hamsters, may hear them
An alternative that goes anywhere
MintGuard balls need no power and can sit inside cupboards, behind appliances, in the loft, the shed and under the car bonnet, which are the places rodents actually hide.
Common questions
Do plug-in mouse repellents work?
Some people report results, but sound can't pass through walls or into cupboards, and mice may get used to it. Combine any repellent with sealing gaps.
Do ultrasonic repellers affect cats and dogs?
Most cats and dogs aren't troubled, but small pets like hamsters, rabbits and guinea pigs may hear them.
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12 pressed peppermint balls per pack. No poison, no traps. Tracked UK delivery and a 90-day money-back guarantee.
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Written by the MintGuard team
Last checked 22 October 2026. Plain, practical advice for UK homes. For a serious or ongoing infestation, contact your local council pest service or a qualified pest controller. Keep all repellents out of reach of children and pets.
