1. High-powered ultrasonic speaker emits super strong ultrasound.
2. It can automatically change its frequencies and alter its sweeping speeds 1-60 times a sound. It is different from other pest repellers which become ineffective due to pests' adaptability to a single-frequency sound.
3. It produce 3-dimensional ultrasonic waves to repel pests within their effective ranges which cover any nooks in all directions, horizontally and vertically.
4. Sonic frequencies under 20kHz can be used outdoors to repel birds, stray cats or dogs and wild animals.