None of them work long term for anything.
yes they do
Cat repellents work by emitting strong scents or creating unpleasant textures that cats find unpleasant. These repellents can be in the form of sprays, granules, or ultrasonic devices. When cats encounter these repellents, they are deterred from entering or staying in the treated area.
Ultrasonic cat repellents can be effective in deterring cats from entering your property by emitting high-frequency sounds that are unpleasant to cats. However, their effectiveness may vary depending on factors such as the cat's temperament and the environment.
Ultrasonic repellents are generally safe for dogs, but their effectiveness in deterring unwanted behavior varies. Some dogs may be unaffected by the sound, while others may be deterred. It is important to consider individual dog's sensitivity to sound and consult with a veterinarian before using ultrasonic repellents.
Ultrasonic mouse repellents emit high-frequency sound waves that are unpleasant for mice but generally safe for dogs. However, some dogs may be sensitive to the sound and experience discomfort or anxiety. It is important to monitor your dog's behavior when using ultrasonic mouse repellents and discontinue use if any negative effects are observed.
No.
Yes, plants act as bug repellents. The repulsion most often can take the form of strong odors, which no bug enjoys carrying around as advertisements of their movements to potential predators and as excuses for shunning in their home colonies and communities. But carnivorous plants also may be considered bug repellents since they capture and dismantle any bug that they can, to compensate for low nitrogen levels in their native soils.
Ultrasonic sensors are used as animal repellents. There are some sensors that are designed to only genereate ultrasound when an animal is detected with the motion sensor.
I've read on-line that most of the repellents (mothballs, sulfur, ultrasonic devices, etc.) do not work at all. These are reptiles, not moths. The best repellent seems to be a physical barrier, such as a fence.
Ultrasonic pest repellents are generally safe for dogs, but some dogs may be sensitive to the high-frequency sound emitted by these devices. It is recommended to monitor your dog's behavior when using an ultrasonic pest repellent and consult with a veterinarian if you have concerns.
Ultrasonic Rodent Repellents are great for controlling for mice. The way they work are, high frequency waves emit a non-repetitive pattern to repel mice and prevent them from invading your home.
The most effective bug repellents to keep insects off your skin during outdoor activities are those containing DEET, picaridin, or oil of lemon eucalyptus.