Blert is an app that sounds most interesting by playing a ringtone when friends get close. When friends appear from about 150 to 300 feet away, the app will alert you with a noise of your choice. The app works with Bluetooth 4.0, meaning it doesn’t require GPS or an internet connection. This saves on battery life!

So, the next time friends are within walking distance, be prepared to hear a sound and hide! Unless you want them to find you…

blert