Visual Doorbell / Doorbells for Hearing Impaired
For noisy environments, elderly with poor hearing or otherwise hearing impaired, a visual doorbell can help ensure visitors aren't missed. The doorbell receiver for these doorbells will typically play a tone or tone and will also light up an indicator or flash a light at the same time to indicate that they've been triggered.
Add multiple receivers for a visual alert in each room of the house or office.