The ring doorbell has a variety of sound options, but there is not an option to change it to a Christmas sound. However, you can set the doorbell to play a custom sound by connecting it to your home's Wi-Fi network. Then, you can download the "Christmas Sounds" app from the Apple App Store or Google Play Store. This app allows you to select from a variety of Christmas-themed sounds, such as jingle bells, sleigh bells, and carols. Once you have chosen the sound you want, you can connect your doorbell to the app, and it will play the sound whenever someone rings the door