1. Touch the switch once to start the mode 1, this mode is low frequency ultrasonic + electromagnetic wave + bionic wave to repel rats and other annoying reptiles. The intelligent variable ultrasound frequency is: 80hz-125hz-150hz-225hz-250hz-350hz-450hz -550hz, the yellow green breathing light of work indication is on. 2. Touch the switch twice to start the mode 2, this mode is high frequency ultrasonic + electromagnetic wave + bionic wave to repel unwelcome mosquitoes and other insects. The intelligent variable ultrasound frequency is: 20khz-25khz-35khz-45khz -55khz-85khz-105khz-125khz, the blue breathing light of work indication is on. 3. Touch the switch 3 times to start mode 3, this mode is variable frequency ultrasonic + electromagnetic wave + bionic wave + mosquito coil heating function to repel rats mosquitoes and other insects, the purple breathing light of work indication is on. (The mosquito coil heating function will automatically power off after 8 hours of work, to use again just replace a new mosquito coil and switch on, which is safe and secure)