SIMPLEX 4100-1249 PART# 742-543 100W CLASS A ADAPTER 41001249 PC BOARD NAC MODULE 100 WATT CLASS "A" ADAPTER 3 OUTPUT 100W Class A Adapter Module; NAC ratings =2 A, 50 W, or 100 speakers maximum Note: Converts six on-board NACs to Class A operation, mounts on 100 W amplifier assembly; Supv.= 1 mA, Alarm = 60 mA 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* SHELF: B