Certainly! The Simplex 4100-1315 is indeed a newer offering compared to the 4100-1321. One of the primary differences lies in its enhanced capabilities for addressing evolving safety standards and technological advancements. The 4100-1315 offers improved processing power and expanded memory capacity, allowing for more efficient data processing and storage. Additionally, it boasts enhanced connectivity features, facilitating easier integration with other building systems and enabling remote monitoring and control functionalities. Overall, upgrading to the 4100-1315 can provide greater reliability, flexibility, and future-proofing for your fire alarm system.