Audio Grenade is the perfect prank app! It plays loud and annoying super high frequency tones, that older people can't hear. Like a dog whistle, or a "mosquito ringtone" does. Select your annoyance level and 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. Also enjoy four more discrete modes! Get Audio Grenade today, and prank everyone!