How does a remote shutter for camera work on Android/iOS?

Question

I\'ve recently ran across a remote shutter for in-built camera app using bluetooth on Android/iOS.

Here\'s an example link of the product that I found: Link (Not here t

Answer 1

The selfie stick remotes are essentially tiny Bluetooth keyboards with just two keys. One is the "Volume Up" key to trigger iOS' native Camera shutter and the other key is "Enter" to trigger Android.