Yes, there is a battery-powered (portable) chime unit compatible with the Byron DBY-22312 doorbell set. The Byron DBY-22321 is a wireless portable chime unit that works with 3x AAA batteries (not included) and can be added to any existing Byron DBY system. It offers a range of up to 150 meters and provides sound and visual LED signals when the doorbell is rung.
This solution is suitable for Model DBY-22312