Patent ID: 7274650

Claim:
A rodent repellent device of random working frequency, comprising: an application-specific integrated circuit (ASIC), further comprising: an internal precision oscillator; a center processing unit (CPU); a wake-up module, being employed as an activation means for enabling the rodent repellent device to have randomized lasting time of wave emission and randomized intermission between two consecutive wave emissions; a read-only memory (ROM), for storing a program controlling the randomization of each intermission between two consecutive wave emissions and the lasting time of each wave emissions; and a random-access memory (RAM); a deterring module, electrically connected to the ASIC, capable of emitting a wave emission selected from the group consisting of an ultrasonic wave, a seismic wave and a sound, the deterring module being configured to be located underground so as to repel burrowing rodents; and a power source, electrically connected to the ASIC, for providing power to the ASIC and a buzzer/motor module.