Maser Ultrasonic Rodent Repellant VHFO Digital USFG 10 is a high frequency random signal generator operating between 2 bands i.e. 20 kHz to 50khs and 30khz to 60khz.The console consists of a master microcontroller and a dedicated driver for the transducers.
The signals from the microcontroller are fed to the dedicated driver. The dedicated driver distributes these signals to the transducers. The transducers then convert these signals in to high frequency sound waves(well above the 20kz frequency which is the upper limit of the hearing range of humans).The transducers emit intensive sound waves at high decibels(sound pressure) that are audible and painful to rodents but are inaudible and harmless to humans. The rodents usually leave the area being protected by the ultrasound waves immediately and at other times it may take as long as 4 to 6 weeks before there is significant reduction in rodent infestation. They do not get killed. The transducers are quiet. If you cannot hear them, do not think the unit is not working. You cannot hear ultrasound.