Button A

This is for main actions, including:

• Search.
• Try Again.
• Preview.
• Check-in Completed (Done).
• Numbers and letters for the on-screen keyboard.

Button B

This is secondary actions, including:

• Home (Back).
• Scroll Up/Scroll Down.
• Back (Preview).
• Previous/Next Household.

Button C

This is configuration and edit actions, including:

• Settings.
• Add/Edit Household.
• Add Guest Settings.
• Delete and Shift the on-screen keyboard.
• Clean Screen button and countdown.