Hertzier is an app that generates high and low frequency sounds. These can be used to annoy or prank your friends. Also, you can play multiple high-frequencies at once, this is going to drive your friends insane. Are you worried about your hearing? Give the hearing test a try and find out how good your ears are. The repellent feature allows you to keep dogs and mosquitoes away from you, adjust the Power Control to increase or decrease the sound intensity. The dog teaser also uses high frequency sounds, wich simulates the dog whistle. Hertzier Platinum can play sound frequencies ranging from 200Hz to 20kHz. Hertzier Platinum - Prank and all of its features are for entertainment purposes only. Have fun pranking. Features: Over 30 high and low frequencies;- User-friendly interface;- Mosquito repellent- Dog teaser- Test your hearing;- Ad free version;PERMISSIONS: None. (Ad free version) Note: Please use this app with caution, playing for a long time on high volume some frequencies can damage your hearing abilities. Hertzier Platinum - Prank and all of its features are for entertainment purposes only.