@professordave, yes the device handler handles 2 different doorbells. They’ll show up as button 1 (green wire) and button 2 (yellow wire). White wire is common. You can set up different notifications for each using the stock Button Controller app or of course CoRE. The device is roughly 3" x 1.5" x .7". For more info and several images, I put together a device overview at http://darwinsden.com/sage-doorbell-sensor-review-smartthings-device-handler/