Turns your device into ultrasound emitter to repel annoying mosquitoes, rats, etc. Even kids can hear the high frequency sounds that an adult cant hear.Features:*Use the wide variety of frequncy to repel mosquitoes rats and any kind of insects.*Activate the loop mode so the sound can keep playing.*Annoy kids by playing the high frequency that most adults cant hear.*Use it to test how good are your hear. While more high frequency you can hear the good your ears are.