The AlertMaster AMDX Door Announcer, by Clarity, is a transmitter that provides alerts to the sound of a door knock or doorbell. It is an ideal solution for those with a moderate-to-severe hearing loss. Nine-volt battery included. The AMDX is an optional accessory to the AM6000 Notification System; a receiver is required. What else do I need to make this work? In order to be notified, you will need to purchase a receiver that lets you know when the signaler or transmitter is activated.
One AMDX Door Announcer/Transmitter Users Guide 1 year manufacturer warranty