Simplex 566-407 Digital Audio Riser Interface PID 8566-407 All fire alarm parts should be installed and tested by a certified fire alarm professional as required by local codes and NFPA. Disclaimer: We are not affiliated with any fire alarm manufacturers or dealers. We offer high quality new and seller reconditioned reliable fire alarm parts to help you maintain your existing fire systems. We buy, sell, and liquidate excess fire alarm parts. NOTE: Please look at the photos carefully. What you see is what you get. I am not an alarm technician. Any mistakes in my listing is unintentional. I am counting upon you to know what you are looking at. We are selling a huge amount of new alarm equipment! Please take a look at our other listings! *WE CAN WORK OUT A DEAL FOR BULK ORDERS* SHELF: A Listing and template services provided by inkFrog