1. obvious and long-term effects: you can see results in 2 weeks to one month after installation.
2. you do not need to take care of corpse and there is no concern of pollution.
3. Free from interference of household appliances: the ultrasonic does not interfere with any household appliances, as it is not wireless electronic wave.
4. Low power consumption to save cost
5. It does not harm people or pets such as cats, fish or birds.
