If you'll go to the following site https://www.chbyron.eu/byron-products/doorentry/wired-doorbells-pushes/byron-00-640-18-2204bc-wired-surface-mounted-bell-00.640.18 below the product click on manuals & download and you can download the manual. Here you can see the wiring information and what it looks like.
Answered by: Byron Product Expert
Date published: 2020-12-14