These wireless doorbells feature Honeywell ActivLink technology and impress with their wireless range of 200 meters. This ensures that you can take the doorbells anywhere in the house and garden while staying informed about any visitors at the door. Thanks to the built-in repeater/wireless amplifier, the range can be extended to up to 400 meters with a second doorbell set. The light ring is equipped with 7 adjustable colors and an LED flash for visual notifications. Custom MP3 melodies (max. 15 MB / max. 15 seconds) can be uploaded. The sleep/silent mode allows the doorbell to be silenced for 3, 6, 9, or 12 hours, or indefinitely. The doorbells come pre-configured and are ready to use immediately after purchase. Alternatively, the doorbell can also be powered via a power adapter with micro-USB (5 V/2 A).