"UNBELIEVABLE!!!!! Seriously PERFECT! Want a co worker to go completely insane...Dogs, Wifes, eveyone, great prank machine." -Actual Review. It blares loud and annoying super high frequency tones, that older people can't hear. Like a dog whistle, or a "mosquito ringtone" does. Select from three head banging sound patterns or choose one of the 6 frequencies. Turn it on in a classroom, the office, or any public place, put your phone in your pocket, and watch people reactions! It's hilarious! You will have everyone searching the room trying to find what's making the sound! The "Ear Splitting" mode will have people screaming and "50 seconds of hell" will get people begging for it stop. Get Audio Grenade today, and prank everyone! What people are saying about Audio Grenade: "I bought and everything they said it does! I tried it with my friends and family and they was going crazy and didn't know where it was coming from! But it's worth the 99 cents" - "Incredible! I had the entire floor at the office walking around saying 'Did you hear that?'" "This app is amazing! My sisters can hear the 17 kHz but no one else can and it pisses them off. Can't wait to use this in my classes and confuse my professors when they see everyone covering their ears :D" -All Real Reviews! Download Audio Grenade and get in on all the fun!