The new iOS camera app called Triggertrap Selfie, launched by camera triggering company Triggertrap, activates the phone camera through sound inputs.
The method is simple: Just point your phone and scream at your camera, and the app will take care of snapping a shot for you, reported petapixel.com.
The app's live view will initially show your face as a jumble of pixel blocks.
To clear up the screen and snap a photo, just make some noise.
"As soon as the shout hits the required number of decibels, the pixelated screen will clear and the camera snaps a selfie," Triggertrap said.
There is also a smart face detection built into the software that makes sure it only snaps a photo when there is a face in the frame.
The selfie can be shared to Twitter from inside the app. Users can download Triggertrap Selfie for free from the Apple App Store. So, keep screaming.