The LISA TX Doorbell Direct is a transmitter which can be hard wired into an existing doorbell.
By doing this you do not need to change your doorbell but can still take advantage of a fully integrated paging system.
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Printed on 28th Feb 2021. Please see https://www.sarabec.com/lisa-tx-doorbell-direct-powered-bell-p127/ for the latest version and links to any instructions for this product.