How does a device for repelling mice work? - briefly
The unit projects ultrasonic or electromagnetic signals that disturb rodents’ hearing or nervous system, prompting them to leave the vicinity. Power comes from batteries or mains, and the system runs continuously until switched off.
How does a device for repelling mice work? - in detail
A mouse‑deterrent system typically combines sensory stimulation with environmental disruption to prevent rodents from entering a space. The core components are a power source, an emission module, and a control circuit.
The emission module generates stimuli that mice find aversive. Common modalities include:
- Ultrasonic waves: frequencies between 20 kHz and 65 kHz exceed human hearing but are easily detected by rodents’ auditory receptors. The circuit produces short bursts, creating an uncomfortable acoustic environment that discourages nesting.
- Electromagnetic fields: low‑intensity, high‑frequency fields interfere with the nervous system of small mammals, producing a mild irritative effect without harming other animals.
- Vibrational pulses: piezoelectric transducers transmit ground‑borne vibrations that mimic predator footsteps, prompting avoidance behavior.
The control circuit regulates pulse duration, interval, and intensity. Adaptive algorithms adjust output based on ambient temperature and background noise to maintain efficacy while conserving battery life. Many units incorporate a motion sensor that activates the stimulus only when rodent activity is detected, reducing unnecessary exposure.
Power is supplied either by replaceable alkaline batteries, rechargeable lithium cells, or a direct AC connection. Voltage conversion stages ensure the emission module receives a stable supply, while protection circuitry guards against overload and short circuits.
Installation guidelines emphasize placement near entry points, along walls, and in concealed corners where mice travel. Proper orientation of the transducer maximizes coverage; a typical device projects a cone of ultrasonic energy covering a radius of 3–6 meters.
Maintenance involves periodic cleaning of the housing to prevent dust accumulation, which can attenuate acoustic output, and checking battery status. Most manufacturers recommend replacement of the unit after 2–3 years of continuous operation to guarantee consistent performance.