Kemo m048 ultrasonic generator module kemo m048 this powerful ultrasonic generator is ideal for chasing away rats mice wild rabbits birds etc when connected to a suitable piezo speaker the module produces an ultrasonic tone with a constantly changing frequency humans can usually only hear frequencies up to 22khz so only the animals will hear the sound a flashing led on the module indicates when it is in operation the module can power up to 5 piezoelectric speakers kemo m048 ultrasou