Android Xamarin Detect Yellow Button Press

Hi,

I want to start activity at the press of the yellow button. For what I see here:

Key detection on form plus making the keyboard disappear on a device with physical keys — Xamarin Forums

https://code.tutsplus.com/tutorials/android-sdk-intercepting-physical-key-events--mobile-10379

I need to use Android.Views.Keycode I'm just wondering what is the keycode of the scanner button.