Simplex 4100-1240 Audio Input Card open package no box This card serves as an interface to integrate additional audio capabilities into your existing fire alarm setup, enhancing both functionality and safety. Crafted with the quality assurance of the Simplex brand, the model 4100-1240 is a reliable choice for those looking to expand their fire alarm system. 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. 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* J-8 LB